Cannot access to Teams Admin Center because of Administrative Unit Role Assignment

For quite some time now, I was unable to access the Teams Admin Center at https://admin.teams.microsoft.com. My account was the only one impacted as other admins could connect just fine.

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https://admin.teams.microsoft.com/service-unavailable

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After reviewing the role assignments on my account using the AzureAD PowerShell module, I’ve detected that a stale role assignment linked to a deleted administrative unit :

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Get-AzureADMSRoleAssignment | ft -Autosize

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However, all the administrative units in the directory have been deleted one day ago :

Get-AzureADMSAdministrativeUnit

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After deleting the stale role assignment using PowerShell, I can now access the Teams Admin Center.

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Remove-AzureADMSRoleAssignment -Id <AssignmentId>

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This cmdlet did not work at first with “Access Denied”, as I think 24h was needed to propagate the deletion of the administrative units.