Hi @Anonymous ,
Could you please share more details about your scenario? Would you like to share the share link of App in Teams for users to use the app with browsers?
If so, after a test with retrieving the link via copy URL in browser’s address bar of a tab opened by below:

I found that the share link indeed could open the app in browser, but still need the user to sign in and ask for privileges. If the user is not in the group in which the app is embedded, they would receive an notification which says you have no privilege to view this data.
If users are in the group, the link is available to open the app in browser, but the only difference with opening it in teams tab is when you move to other Teams tabs the app would work in the browser without any influence.
Hope this helps.
Best regards,
Community Support Team _ Jeffer Ni
If this post helps, then please consider Accept it as the solution to help the other members find it.