Geographical Restrictions

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Incorrect Number Type: Ensure you are trying to assign the correct type of number to the user. User numbers (subscriber numbers) are different from service numbers (used for auto attendants and call queues). Assigning a service number to a user will typically not be allowed.
Number Already Assigned: The phone number you are attempting to assign might already be assigned to another user, resource account (for auto attendants or call queues), or even a conferencing bridge within your Microsoft 365 tenant. Phone numbers must be unique within the tenant.
Assignment to Incorrect Object Type: You might be trying to assign the phone number to the wrong object type in the Microsoft Teams admin center. Phone numbers intended for users should be assigned to user accounts, not bulgaria phone number list resource accounts or other objects.
Provisioning Delays: After acquiring or porting numbers, there might be a delay in the provisioning process before they become available for assignment. Check the status of the number in the Teams admin center.
Phone number availability is often tied to geographical regions. Ensure the number you are trying to assign is within a supported region for your tenant and the user's location if there are regional policies in place.
Calling Plan Mismatch: The geographical scope of the assigned calling plan must align with the location of the phone number being assigned. For example, assigning a UK phone number to a user with only a US domestic calling plan might fail.
Direct Routing Configuration Issues: If your organization utilizes Direct Routing to connect Teams to your own Session Border Controllers (SBCs), there might be configuration issues with the SBC, the SIP trunk, or the online voice routing policies that prevent number assignment.
Emergency Address Requirements: For direct dial numbers, an emergency address must be associated with the user's location. If this information is missing or incorrectly configured, number assignment might be blocked due to regulatory requirements.
Tenant Configuration Problems: Underlying tenant-level configurations related to telephony or user management might be preventing number assignment.