Does this issue persist all the time? Or what changes do you do before this issue happened?
Does anyone else have the same issue as yours?
It recommends you try in another machine and verify the result.
Moreover, Teams for Linux only supports for desktop, PowerPoint and Whiteboard sharing. About sharing single application windows, it is not supported now. I find a user voice about this feature. You could vote for it here.
Microsoft will always focus on customer’s feedback and experience. Some new features would be added to the services based on customers' feedback in the future, and your good ideas will be very helpful for them to improve the service.
Your time, understanding and cooperation will be highly appreciated.
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