Investigate Potential Conflicts

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Verify Number Type: Confirm that the number is a "User (Subscriber)" number and not a "Service" number if you are assigning it to an individual user.
Note Provisioning Status: If the number was recently acquired or ported, check its provisioning status for any pending actions or errors.
Step 3: Attempt Assignment Through the Teams Admin Center

Navigate to Users > Manage users: Select the user to whom you want to assign the phone number.
Click on "Account" tab: Go to the "Account" tab for the user.
Find "Phone number": Locate the "Phone number" section.
Click "Assign": Click the "Assign" button.
Select Number Type: Choose the appropriate number type (usually "Direct number").
Search and Select Number: Search for the available phone number you want to cameroon phone number list assign and select it.
Emergency Location: If assigning a direct number, ensure a valid emergency location is associated with the user. You might need to configure emergency addresses under Voice > Emergency policies > Emergency addresses first.
Click "Apply": Click the "Apply" button to save the assignment.
Monitor for Errors: Pay close attention to any error messages that appear during the assignment process. These messages often provide clues about the underlying issue.

Check Other Users and Resource Accounts: Ensure the phone number is not already assigned to another user, a resource account (for an auto attendant or call queue), or a conferencing bridge.
Review Conferencing Bridges: Navigate to Meetings > Bridges in the Teams admin center and check if the number is associated with a conference bridge.
Examine Resource Accounts: Go to Teams apps > Resource accounts and verify that the number is not assigned to a resource account.
Step 5: Address Geographical and Calling Plan Alignment

Verify Number Location: Confirm the geographical location associated with the phone number.
Match with Calling Plan Scope: Ensure the assigned calling plan covers the geographical region of the phone number. For instance, a US number typically requires at least a US domestic calling plan.