Hi All,
Sorry for the inconvenience Teams for Mac brought to you, based on your description, I have tested on the latest Mac Catalina and Teams for Mac(1.2.00.22561), and I found no such issue. Therefore, in order to summary and further investigate this issue, would
you mind helping to offer me more information? Thanks for your cooperation.
- The detailed version of your Mac OS.
- The detailed version of your Microsoft Teams client.
- Whether the issue occurred after updating Mac OS or updating Microsoft Teams.
- Whether you cannot share app screen, desktop or both. Is there any error message? Please help to capture a screenshot of the problematic window.
- Is your account managed in Office 365, on-premises, or hybrid?
We will try our best to investigate and check this issue for you, your understanding and time is highly appreciated.
Best Regards,
Betty
Hi Betty
Full detailed answer to your questions
- The detailed version of your Mac OS
10.15 (19A602)
- The detailed version of your Microsoft Teams client.
You have Microsoft Teams Version 1.2.00.28258. It was last updated on 18/10/2019
- Whether the issue occurred after updating Mac OS or updating Microsoft Teams.
I think they both updated same day so hard to say
- Whether you cannot share app screen, desktop or both. Is there any error message? Please help to capture a screenshot of the problematic window.
on clicking share screen you get one of the following messages

or

- Is your account managed in Office 365, on-premises, or hybrid?
We have a multi building company, the Tech is in a different building, so not sure if that answers your questions
Unsure if it helps but while in a meeting when i clicked share, it seemed to be offering lots off PPT files rather than the normal desktop and app views that I had open - PPT wasnt open at the time