MS Teams Desktop App displays "You've stumbled on a restricted space" for a page added as a tab in a channel

Issue Summary

MS Teams Desktop App displays "You've stumbled on a restricted space" for a page added as a tab in a channel when Confluence Global Permissions are set to Use Confluence for Anonymous users.

Steps to Reproduce

1. Go to Confluence Settings > Global Permissions > Anonymous access
   https://<instance>.atlassian.net/wiki/admin/permissions/global?tab=anonymous
2. Enable Use Confluence for Anonymous users
3. Open the MS Teams Desktop App
4. Select a Channel and click the plus "+" icon
5. Search and select Confluence Cloud
6. Attach an existing Confluence Page by clicking Attach Page
7. Search by title and select a Confluence Page
8. Click Save
9. Try to load the page and observe the error "You've stumbled on a restricted space"
10. Open the same page in the MS Teams Web App and the page loads as expected
11. Open the page in Confluence and the page loads as expected

Expected Results

The page should load in the MS Teams Desktop App Channel's tab.

Actual Results

"You've stumbled on a restricted space" error message is displayed in place of the page's content in the MS Teams Desktop App Channel's tab.

Workarounds

• Use the MS Team Web app.
• If anonymous access is not required on the site, it can be disabled in Global Permissions and the page will load as expected.