A partner at a different organization invited me to join a Team. I can't access the account--the issue:
1. Clicked invite to join Team created by partner
2. Signed in to Teams using my Office 365 Premium account (joined to my business domain)
3. The Team doesn’t display under the ‘Teams’ section
4. The notification next to my account name tells me I have six new alerts/messages (I also received six email alerts stating I’ve been tagged in a discussion in the Team I was invited to)
5. When I click on my account name, it show me an alternate account I didn't create called 'Microsoft (guest)'. The notifications are attached to this account, not my primary business account. T

1. When I click on the 'Microsoft' account, I receive a pop up: “Want to switch to Microsoft? We might ask you to sign in again.”
   When I click Yes, Teams refreshes, auto-signs me back in and loops back to the same alert (step 6). From then on, I’m stuck in the same loop.

Please fix this bug. On Android guests can log into Teams if they first log in on the Teams web app. But on iOS browsers (both Safari and Edge), the link to join a team takes user to the mobile site, and there is no option to open the Teams web app, even if they request desktop site (except on older devices like iPhone 5S).

This bug has been confirmed on multiple devices (iPad, iPhone 8, etc. as well as with the newest version of iOS (13.5.1))

Even if users first log into Teams web app on desktop and then try to log into guest account in iOS mobile app it doesn't work (see error message attached).

Please see this bug for more info and a video https://microsoftteams.uservoice.com/forums/908686-bug-reports/suggestions/38737450-guest-users-cannot-log-in-into-teams-on-ios-device (I posted here so it is in the right category)

Thank you in advance for providing support.

In Teams, if I hold a "meeting now" from a channel, I can get a meeting-specific URL from the top of the meeting participant list.
By sharing this URL with channel members and with non-channel members, anyone who clicks the URL can join and hold a meeting at any time.

This URL can also be used by guest members (not channel members). When the guest member joins the meeting, the guest waits in the lobby, so that the channel member can join the meeting by approving the guest.

However, when a channel member starts a meeting first and a guest member tries to join there, the guest's “Lobby Waiting” may not be displayed. Guest "lobby wait" is not displayed in the menu in the center of the meeting nor in the participant list.

On the other hand, when the guest first joins the conference and then the channel member tries to join the conference, the guest is displayed in the lobby waiting for the channel member.

If a channel member starts a channel conference first and then a guest member tries to join, if the guest's "lobby wait" is not displayed, the channel member will not be able to understand the lobby wait and will keep the guest waiting forever .
I would like you to solve the problem of this channel conference.

I attempted to add a GUEST to our team. I had no other choice than adding him as a MEMBER of the team. I don’t want him to be a member because a member can get access to other teams in our organization.

The Guest email is t##@##.com. I added him as a guest by inputing a wrong email address t##@##.com.tr, so i removed it from our team. Now when I tried adding him as a guest, Team doesn’t give me a suggestion of “add t##@##.com as a Guest”. It only gives me suggestion of either “add t##@##.com as a member or “add t##@##.com.tr as a guest.”

On my account, I have access to several guest Teams. MFA is enabled on my account. For no reason, access to one of those guest Teams doesn't work anymore (used to work); switching to other Teams works. The process (and what it should be):
* My Teams/other guest Teams: Logon > MFA approval dialog > Approve on phone > Default team shows > Switch in app > app shows Team selected
* Problem Guest Team: Logon > MFA approval dialog > Approve on phone > Default Team shows > Switch to problem team > MFA approval dialog > no approval queued for phone, code doesn't work, etc. Can't bypass this MFA dialog which doesn't do anything.
Already tried disabling MFA, so now I have no (initial) MFA prompt, but for that problematic guest Team, I still get the MFA challenge which isn't an MFA challenge (no notifications pending).
This problem manifests in the same way on desktop client as well as iOS client when switching to that team.
Ideas/thoughts?

I refer to Case ID:20320290 and to official document "Add a guest to a team". It says Global admins OR Teams admins and team owners can add a guest to a team in the Teams clients OR in the Teams admin center. However as a Global Admin, I get an error: "We can't find any team members to add." The Microsoft Support has advised me to use uservoice. Right now, to add guest, the global admin has to join the team as an owner then use the Team clients. It is not operationally feasible for the Global Admin to join every team as an owner.