MacOS unable to share screen, Teams not listed under Screen Recording in settings

1. Go to System Preferences > Click Security & Privacy > Privacy tab.
2. If there is a Team Application, try to delete it first by select the "Teams Application list" and click the minus " - " sign in the left corner of the selection box
3. When finished, click the plus " + " sign in the left corner of the selection box, browse the Application > select the Microsoft Team (work or school).app and click OPEN
4. Now retry the share screen on Teams, it should work.

Kyle_Mac_Specialist Kyle that is not the solution. There is no need to create a new account and this is not what I would advise an ordinary user. Please see rickyroca73. Here is his solution which I credit to him at the end. 

I found the solution in the Microsoft Technical Forum (excuse me for not being as precise as I can be, I've been out of the Microsoft world for 12 years since I retired. I just came back since an organization I'm in chose M365 and Teams)

The problem is in Settings:  Teams - Setting - Application - New Meeting Experience

You need to uncheck that setting and quit Teams and log back into the Desktop app. Start a Video call and click  the Share Icon. You'll notice a new window pop-up that looks different from the previous pop-ups which will take you to the System Preferences - Security & Privacy - Screen Recording: and lo and behold there is the Microsoft Teams which you should check to allow access. (note you may have to unlock Security & Privacy with an admin account password)

After you've verified that screen sharing is working you can re-enable the new meeting experience and it will perform normally. This is not my solution so credit should not come to me but to rickyroca73

Mike_Fein Have you tried the resolution I listed? I am an MSP and it has worked every time for me on multiple Macs running Catalina and Teams. If you have not seen my one.... long story short is create a new user account, sign your teams account in there, got to meet now, create a meeting, then share your screen, do the security tick box there, log out and it carries over to the actual user account and instance of teams. it has worked in the double figures for myself as I specialise in Macs I have seen this many times during 2020. Mght not work for all but it takes five minutes to try it.

Rangith That worked. Thanks

I was never offered the option from within my meeting. Frustrating

MICROSOFT!!! You're killing us!

Rangith Thank you, thank you, thank you!! I tried just about everything and was about to through my macbook out of the window and get a Windows machine until I read your solution. Just kidding about the Windows machine.. :-).

Rangith This worked. Thanks for the tip.

Rangith I could not get Teams to show up in the Screen Recording section of the privacy settings, when attempting to share in a meeting's chat, but it did show for me when starting a direct chat with someone and choosing the share screen button at the top of the chat. 

Rangith You're the MVP. It worked. Thanks!

Rangith thks it worked, I had to turn off the new meeting experience though (new meetings and calls in separate windows)

Rangith, I was very close to give up on this issue until I read your post :).  It worked!!!!  Thank you so much.

Rangith Having tried everything else, I was almost going to give up hope. Then I tried what you suggested and it worked! Thank you!