We link the asana webpage into Microsoft Teams , using the “website” linking feature in MS Teams. Has always worked very well until the new Teams update. Now I get this message “You’re viewing content from Log in - Asana… Be sure you trust this site before using it. If the site doesn’t load properly, open it in a browser.”
I am also having the same issue. Use Web link option in Teams, add the Asana project link and I get the Welcome / Sign in to Asana link. But entering my user name and password just cycles back to the login screen. I can click the ‘Open in browser’ link at the top of the website page in Teams and that opens in the browser and displays the Asana projects in the browser. But not giving desired functionality where the page should display in Asana.
For your information and before somebody uses to much time to search a solution, this is a general issue with the new Teams and not only asana related, even SharePoint sites have the same issue: ext. link to: answers.microsoft.com forum