Verify Licensing Prerequisites

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Synchronization Issues: In hybrid environments or tenants with complex directory synchronization setups, delays or errors in synchronization between on-premises Active Directory and Azure AD can sometimes lead to issues with assigning licenses or phone numbers.
Admin Center Errors or Bugs: While less common, temporary glitches or bugs within the Microsoft Teams admin center itself can sometimes prevent successful number assignment.
PowerShell Errors: If you are attempting to assign numbers via PowerShell, incorrect syntax, missing modules, or insufficient permissions can lead to failures.
A Systematic Approach to Troubleshooting Phone Number Assignment Failures

When faced with the inability to assign a phone number to a Teams user, a structured cambodia phone number list troubleshooting approach is essential to efficiently identify and resolve the underlying cause.


Check User Licenses: In the Microsoft 365 admin center navigate to Users > Active users, select the user in question, and review their assigned licenses. Ensure they have a qualifying Microsoft 365 plan, a Phone System license (if required), and an appropriate Calling Plan license.
Confirm Add-on Licenses: If the base plan doesn't include Phone System, verify that the Phone System add-on license is also assigned.
Inspect Calling Plan Details: Review the specifics of the assigned calling plan (e.g., Domestic, International) to ensure it aligns with the intended use and the geographical location of the number.
Check Communication Credits: If using a pay-as-you-go plan or making international calls, verify that Communication Credits are set up and available for the tenant.
Step 2: Examine the Phone Number Inventory

Navigate to Teams Admin Center: Open the Microsoft Teams admin center
Go to Voice > Phone numbers: Review the list of phone numbers acquired by your organization.
Check Number Status: Ensure the number you are trying to assign has a status of "Available" and is not already assigned to another object.