Additional features, settings, or issues not covered by specific Microsoft Teams categories
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Unfortunately, there is no direct way to assign a second phone number to a user in Microsoft Teams. Teams does not allow a user to have more than one phone number assigned to them
Note: You might need to translate the page content in the link shared below.
https://learn.microsoft.com/microsoftteams/assign-change-or-remove-a-phone-number-for-a-user
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Ajibola.