diff --git a/app/assets/javascripts/discourse/app/templates/user-invited-show.hbs b/app/assets/javascripts/discourse/app/templates/user-invited-show.hbs
index 9396e7f90f5..2079edb3e28 100644
--- a/app/assets/javascripts/discourse/app/templates/user-invited-show.hbs
+++ b/app/assets/javascripts/discourse/app/templates/user-invited-show.hbs
@@ -145,5 +145,9 @@
         {{/if}}
       </section>
     {{/load-more}}
+  {{else}}
+    <div class="alert alert-error invite-error">
+      {{model.error}}
+    </div>
   {{/if}}
 {{/d-section}}
diff --git a/app/assets/stylesheets/common/base/user.scss b/app/assets/stylesheets/common/base/user.scss
index cc8666133ce..24a318e2fbe 100644
--- a/app/assets/stylesheets/common/base/user.scss
+++ b/app/assets/stylesheets/common/base/user.scss
@@ -782,3 +782,9 @@
 .timezone-input {
   margin-bottom: 0.5em;
 }
+
+.user-invites-page {
+  .invite-error {
+    grid-column: 1 / span 2;
+  }
+}
diff --git a/app/controllers/users_controller.rb b/app/controllers/users_controller.rb
index ebbf9db736b..aa82acb8a64 100644
--- a/app/controllers/users_controller.rb
+++ b/app/controllers/users_controller.rb
@@ -11,7 +11,7 @@ class UsersController < ApplicationController
     :update_second_factor, :create_second_factor_backup, :select_avatar,
     :notification_level, :revoke_auth_token, :register_second_factor_security_key,
     :create_second_factor_security_key, :feature_topic, :clear_featured_topic,
-    :bookmarks, :invited
+    :bookmarks, :invited, :invite_links
   ]
 
   skip_before_action :check_xhr, only: [
@@ -369,57 +369,87 @@ class UsersController < ApplicationController
   end
 
   def invited
-    guardian.ensure_can_invite_to_forum!
+    if guardian.can_invite_to_forum?
+      offset = params[:offset].to_i || 0
+      filter_by = params[:filter] || "redeemed"
+      inviter = fetch_user_from_params(include_inactive: current_user.staff? || SiteSetting.show_inactive_accounts)
 
-    offset = params[:offset].to_i || 0
-    filter_by = params[:filter] || "redeemed"
-    inviter = fetch_user_from_params(include_inactive: current_user.staff? || SiteSetting.show_inactive_accounts)
+      invites = if guardian.can_see_invite_details?(inviter) && filter_by == "pending"
+        Invite.find_pending_invites_from(inviter, offset)
+      elsif filter_by == "redeemed"
+        Invite.find_redeemed_invites_from(inviter, offset)
+      else
+        []
+      end
 
-    invites = if guardian.can_see_invite_details?(inviter) && filter_by == "pending"
-      Invite.find_pending_invites_from(inviter, offset)
-    elsif filter_by == "redeemed"
-      Invite.find_redeemed_invites_from(inviter, offset)
+      show_emails = guardian.can_see_invite_emails?(inviter)
+      if params[:search].present? && invites.present?
+        filter_sql = '(LOWER(users.username) LIKE :filter)'
+        filter_sql = '(LOWER(invites.email) LIKE :filter) or (LOWER(users.username) LIKE :filter)' if show_emails
+        invites = invites.where(filter_sql, filter: "%#{params[:search].downcase}%")
+      end
+
+      render json: MultiJson.dump(InvitedSerializer.new(
+        OpenStruct.new(invite_list: invites.to_a, show_emails: show_emails, inviter: inviter, type: filter_by),
+        scope: guardian,
+        root: false
+      ))
     else
-      []
-    end
+      if current_user&.staff?
+        message = if SiteSetting.enable_sso
+          I18n.t("invite.disabled_errors.sso_enabled")
+        elsif !SiteSetting.enable_local_logins
+          I18n.t("invite.disabled_errors.local_logins_disabled")
+        end
 
-    show_emails = guardian.can_see_invite_emails?(inviter)
-    if params[:search].present? && invites.present?
-      filter_sql = '(LOWER(users.username) LIKE :filter)'
-      filter_sql = '(LOWER(invites.email) LIKE :filter) or (LOWER(users.username) LIKE :filter)' if show_emails
-      invites = invites.where(filter_sql, filter: "%#{params[:search].downcase}%")
+        render_invite_error(message)
+      else
+        render_json_error(I18n.t("invite.disabled_errors.invalid_access"))
+      end
     end
-
-    render json: MultiJson.dump(InvitedSerializer.new(
-      OpenStruct.new(invite_list: invites.to_a, show_emails: show_emails, inviter: inviter, type: filter_by),
-      scope: guardian,
-      root: false
-    ))
   end
 
   def invite_links
-    guardian.ensure_can_invite_to_forum!
+    if guardian.can_invite_to_forum?
+      inviter = fetch_user_from_params(include_inactive: current_user.try(:staff?) || (current_user && SiteSetting.show_inactive_accounts))
+      guardian.ensure_can_see_invite_details!(inviter)
 
-    inviter = fetch_user_from_params(include_inactive: current_user.try(:staff?) || (current_user && SiteSetting.show_inactive_accounts))
-    guardian.ensure_can_see_invite_details!(inviter)
+      offset = params[:offset].to_i || 0
+      invites = Invite.find_links_invites_from(inviter, offset)
 
-    offset = params[:offset].to_i || 0
-    invites = Invite.find_links_invites_from(inviter, offset)
+      render json: MultiJson.dump(invites: serialize_data(invites.to_a, InviteLinkSerializer), can_see_invite_details:  guardian.can_see_invite_details?(inviter))
+    else
+      if current_user&.staff?
+        message = if SiteSetting.enable_sso
+          I18n.t("invite.disabled_errors.sso_enabled")
+        elsif !SiteSetting.enable_local_logins
+          I18n.t("invite.disabled_errors.local_logins_disabled")
+        end
 
-    render json: MultiJson.dump(invites: serialize_data(invites.to_a, InviteLinkSerializer), can_see_invite_details:  guardian.can_see_invite_details?(inviter))
+        render_invite_error(message)
+      else
+        render_json_error(I18n.t("invite.disabled_errors.invalid_access"))
+      end
+    end
   end
 
   def invited_count
-    guardian.ensure_can_invite_to_forum!
+    if guardian.can_invite_to_forum?
+      inviter = fetch_user_from_params(include_inactive: current_user.try(:staff?) || (current_user && SiteSetting.show_inactive_accounts))
 
-    inviter = fetch_user_from_params(include_inactive: current_user.try(:staff?) || (current_user && SiteSetting.show_inactive_accounts))
+      pending_count = Invite.find_pending_invites_count(inviter)
+      redeemed_count = Invite.find_redeemed_invites_count(inviter)
+      links_count = Invite.find_links_invites_count(inviter)
 
-    pending_count = Invite.find_pending_invites_count(inviter)
-    redeemed_count = Invite.find_redeemed_invites_count(inviter)
-    links_count = Invite.find_links_invites_count(inviter)
-
-    render json: { counts: { pending: pending_count, redeemed: redeemed_count, links: links_count,
-                             total: (pending_count.to_i + redeemed_count.to_i) } }
+      render json: { counts: { pending: pending_count, redeemed: redeemed_count, links: links_count,
+                               total: (pending_count.to_i + redeemed_count.to_i) } }
+    else
+      if current_user&.staff?
+        render json: { counts: 0 }
+      else
+        render_json_error(I18n.t("invite.disabled_errors.invalid_access"))
+      end
+    end
   end
 
   def is_local_username
@@ -1639,4 +1669,12 @@ class UsersController < ApplicationController
   def summary_cache_key(user)
     "user_summary:#{user.id}:#{current_user ? current_user.id : 0}"
   end
+
+  def render_invite_error(message)
+    render json: {
+      invites: [],
+      can_see_invite_details: false,
+      error: message
+    }
+  end
 end
diff --git a/config/locales/server.en.yml b/config/locales/server.en.yml
index b87d9e9ffc9..2458646d70c 100644
--- a/config/locales/server.en.yml
+++ b/config/locales/server.en.yml
@@ -218,6 +218,10 @@ en:
     user_exists: "There's no need to invite <b>%{email}</b>, they <a href='%{base_path}/u/%{username}/summary'>already have an account!</a>"
     confirm_email: "<p>You’re almost done! We sent an activation mail to your email address. Please follow the instructions in the mail to activate your account.</p><p>If it doesn’t arrive, check your spam folder.</p>"
     cant_invite_to_group: "You are not allowed to invite users to specified group(s). Make sure you are owner of the group(s) you are trying to invite to."
+    disabled_errors:
+      sso_enabled: "Invites are disabled because SSO is enabled."
+      local_logins_disabled: "Invites are disabled because the 'enable local logins' setting is disabled."
+      invalid_access: "You are not permitted to view the requested resource."
 
   bulk_invite:
     file_should_be_csv: "The uploaded file should be of csv format."
diff --git a/spec/requests/users_controller_spec.rb b/spec/requests/users_controller_spec.rb
index fc35cc08967..1358355dd86 100644
--- a/spec/requests/users_controller_spec.rb
+++ b/spec/requests/users_controller_spec.rb
@@ -1556,7 +1556,7 @@ describe UsersController do
     it "fails for anonymous users" do
       user = Fabricate(:user)
       get "/u/#{user.username}/invited_count.json"
-      expect(response.status).to eq(403)
+      expect(response.status).to eq(422)
     end
 
     it "works for users who can see invites" do
@@ -1713,7 +1713,7 @@ describe UsersController do
             end
 
             get "/u/#{inviter.username}/invited/pending.json"
-            expect(response.status).to eq(403)
+            expect(response.status).to eq(422)
           end
         end
       end
@@ -1760,6 +1760,21 @@ describe UsersController do
             expect(response.status).to eq(403)
           end
         end
+
+        context 'when local logins are disabled' do
+          it 'explains why invites are disabled to staff users' do
+            SiteSetting.enable_local_logins = false
+            inviter = sign_in(Fabricate(:admin))
+            Fabricate(:invite, invited_by: inviter,  email: nil, max_redemptions_allowed: 5, expires_at: 1.month.from_now, emailed_status: Invite.emailed_status_types[:not_required])
+
+            get "/u/#{inviter.username}/invite_links.json"
+            expect(response.status).to eq(200)
+
+            expect(response.parsed_body['error']).to include(I18n.t(
+              'invite.disabled_errors.local_logins_disabled'
+            ))
+          end
+        end
       end
     end
   end