Unable to open a custom SharePoint form in a SharePoint tab in the new Teams desktop client

[jusper-dk]

Target SharePoint environment

SharePoint Online

What SharePoint development model, framework, SDK or API is this about?

💥 SharePoint Framework

Developer environment

None

What browser(s) / client(s) have you tested

• [ ] 💥 Internet Explorer
• [ ] 💥 Microsoft Edge
• [ ] 💥 Google Chrome
• [ ] 💥 FireFox
• [ ] 💥 Safari
• [ ] mobile (iOS/iPadOS)
• [ ] mobile (Android)
• [ ] not applicable
• [X] other (enter in the "Additional environment details" area below)

Additional environment details

• New Teams Desktop Client > SharePoint tab

Describe the bug / error

While opening a custom form from a list view in a SharePoint tab in the new Teams desktop client, spserviceworker cuts off authentication cookies and finally redirects to login.microsoft.com:

1. listform.aspx redirects to the right URL (a custom form)
2. spserviceworker (https://res-1.cdn.office.net/files/odsp-web-prod_2023-12-01.001/spserviceworker.js) doesn't pass authentication cookies (SPOIDCRL)
3. Redirects to /_layouts/15/Authenticate.aspx
4. Redirects to /_forms/default.aspx
5. Redirects to https://login.microsoftonline.com/

Network logs:

Steps to reproduce

1. Create a custom form for a SharePoint list or just add assign any page from the same site to ContentType.DisplayFormUrl https://learn.microsoft.com/en-us/previous-versions/office/sharepoint-csom/ee540653(v=office.15)
2. Add a SharePoint tab in the New Teams desktop client and select the SharePoint list with customized form
3. Open a form
4. You'll get an empty page (login.microsoftonline.com)

Expected behavior

How it works in the old Teams desktop client:

[ghost]

Thank you for reporting this issue. We will be triaging your incoming issue as soon as possible.

[xxyziggy]

The custom SharePoint form created using the tutorial is not functioning in the new Microsoft Teams desktop version.

Environment:

Microsoft Teams Desktop Version: 23320.3027.2591.1505 Client Version: 49/23113028718

Steps to Reproduce:

1. Create a custom form using the tutorial
2. Create a SharePoint tab in Misrosoft Teams with a list view
3. Try to open list item form

Expected Behavior:

List form opens normally

Actual Behavior:

Blank screen appears

Logs:

Refused to display 'https://login.microsoftonline.com/' in a frame because it set 'X-Frame-Options' to 'deny'.

Screenshots:

Number of redirects happen in MS Teams tab, but /_layouts/15/SPListForm.aspx never loads This happens because /_layouts/15/listform.aspx does not pass auth cookie

Normal behaviour in SharePoint

[xxyziggy]

Any updates on the issue?

[Amey-MSFT]

Hello @jusper-dk, Thank you for bringing this issue to our attention. Could you please confirm if the issue still persists for you?

[Amey-MSFT]

We are closing this issue for now. If the problem persists, feel free to reopen it or open a new one.