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Select the Teams icon in the taskbar or dock, or go to Start, type Teams and select it.
On Mac, go to the Applications folder and select Microsoft Teams.
For Mobile, tap the Teams icon and sign in with your Microsoft 365 username and password. -
When Teams comes up, do one of the following:
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If you see Pick an account to continue or Continue as, select your email address.
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To change email addresses or accounts, select Use another account or sign up at the bottom of dialog box.
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Depending on your organization, you may be asked for further verification.
To change accounts from in Teams, select your initials or profile picture at the top of the app, choose Sign out, and then sign back in with the other account.
For more info, see Sign in to Teams.