Anupam_Pattnaik Can you please tell me more about this "including custom line-of-business apps, third-party apps, "
We have created a Personal App for our organization that is in our Teams Apps policy to load in left Nav of Teams for everyone. All it does is load a SharePoint List that everyone has access to.
The Azure App ID and security settings were all set up prior to the New Teams being rolled out.
This internally developed Business App works in Classic Teams and the Web version BUT NOT in the "New Teams". There is no error message, and it now doesn't show the list. The only features that now work in the App are the "About" and the organization links for "Website, Privacy Policy, and Terms of use" that are part of the manifest.
Oh and the "Go to website" at top right of the App window does open a Web Browser and loads the SP List as it should do in the App.