We've tested many times and many ways.
The Guest User cannot give control of their screen when they doing Screen Sharing in chat.
The workaround is we can schedule a Teams meeting but it will be more handy if this functionality can be added in the chat!!!
Please remove some restriction on Guest User when they are using the main features about Teams!!!
Thanks a lot in advance!

unable to add people from outside the org to team or invite to a meeting. It says "we didn't find a match" and add button is grayed out.

I got an invitation to a Team over gmail address. When I click on the invitation, I get prompted for a MS account, which I have. After I enter my MS account and set everything up, my Teams would load up with no teams joined or whatever. So basically I cannot access the team I was invited to at all whatever I try to do. I would always just get redirected to my MS profile which does not have the invitation linked to it.

When I switch to a tenant where I have Guest Access my tenant pick list doesn't include my primary tenant for my company. This is a new behavior since yesterday.

Quiz within Teams/Assignments can not be opened from a guest user. A user within the organisation can open the quiz. If this would work for the quests as well would be nice.

Ticket for the investigation: 16157244

Guests that belong to the team and are added to a private channel in that Team cannot see the private channel. We created a Team to work with a client back in March. It only had one channel (General) until December. We decided to test the Private Channel capability with a few of the members. We added two guests and an internal person

Unfortunately, for some reason the guest users cannot see the additional tabs anymore (only conversations and files). This problem is known since today. Are there any new settings in the Teams Admin Center that we missed / did not catch?

Guest users do not have the inline translation of messages available to them, even thought it is activated in the tenant accessed as a guest. Can this please be made available.

somebody outside my organization accidently sent a request to join their org instead of a request to join a meeting. there's no option given to decline the request, only "accept" and "cancel". cancel doesn't really do anything, and now I have a persistent notification that I can't get rid of, in both mobile and Windows app

I have the option to try again or sign out.

If I was previously on the 'guest' account then I will be forever stuck in an infinite loop.

I remedied this by uninstalling the 64-bit and installing the 32-bit which provided all required functionality.

Dear all,

I have problems. I cannot add external users and this problems have been repeated.

Guest permissions are not fully functional, guest users can enumerate users and see others details. Please see attached.
When we have guest users in a team we don't expect them to see others' names and emails. We could deactivate the ability to create a chat inside Teams, but they can still see others email addresses.

We use Teams (Office 365) and our guest wanted to access our meeting, using the browser access possibility. We tried to accept their request to join us, but the action failed and the guest remained in the "waiting room". Our guest's workaround was to download and use the desktop app. But a working guest access by way of the web browser would be much better ...

Guest permissions both set in Teams and admin center apply only to General channel. If we create a new channel under the team, guest users can reply to posts, and even create new posts.

The most important thing is: Get an error "You are not authorized" while trying to add a guest as super admin. We didnt configure anything on the azuresite, because we could invite guests and work with them on a team.

After one week we cant add new guests and the existing guests are not able to look in there teams. But he is in the organisation as "guest" listed.

I invited a Guest from another O365 tenant to one of my teams. When he tries to login to my tenant he gets a something went wrong error. Then, he created a team and invited me to it. I tried logging in and I get a something went wrong error, too.

I'm using the Mac application. I believe he's using the Windows application.

The process of creating the team channel and adding the guest seems to work fine. We each got invitations from the other in our tests.