Review Tenant Voice Settings

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Consider User Location Policies: If your organization has implemented user location policies, ensure the user's assigned location aligns with the number's region.
Step 6: Troubleshoot Direct Routing (If Applicable)

Check SBC Connectivity: Verify the health and connectivity status of your Session Border Controllers (SBCs).
Examine SIP Trunk Configuration: Ensure the SIP trunk connecting your SBC to Microsoft Phone System is correctly configured and active.
Review Online Voice Routing Policies: Verify that the online voice routing policies are correctly configured to route calls to and from the user via the SBC.
Inspect Voice Policies: Check the assigned voice policies for the user to ensure they are cayman islands phone number list compatible with Direct Routing.
Use PowerShell for Direct Routing Diagnostics: Utilize PowerShell cmdlets (e.g., Get-CsOnlinePSTNGateway, Get-CsOnlineVoiceRoute, Get-CsOnlineUser) to diagnose Direct Routing configurations and identify potential issues.
Step 7: Investigate Tenant-Level Configurations

Examine the overall voice settings in the Teams admin center for any tenant-wide configurations that might be affecting number assignment.
Check Organizational Policies: Review organizational policies related to telephony and user management.
Step 8: Address Synchronization Issues (Hybrid Environments)

Force Directory Synchronization: If you have a hybrid environment, try manually forcing a directory synchronization between your on-premises Active Directory and Azure AD to ensure user and attribute information is up-to-date.
Check Azure AD Connect Health: Monitor Azure AD Connect Health for any synchronization errors.
Step 9: Consider PowerShell for Assignment (Alternative Method)

Install Teams PowerShell Module: Ensure you have the latest Microsoft Teams PowerShell module installed (Install-Module MicrosoftTeams).
Connect to Teams: Connect to your Teams tenant using Connect-MicrosoftTeams.
Use Set-CsOnlineUser Cmdlet: Attempt to assign the phone number using the Set-CsOnlineUser cmdlet with the -PhoneNumber parameter. For example:
PowerShell

Set-CsOnlineUser -Identity "[email protected]" -PhoneNumber "+15551234567" -PhoneNumberAssignmentStatus $true -LocationPolicy "YourLocationPolicy"
(Replace "[email protected]" with the user's UPN, "+15551234567" with the phone number, and "YourLocationPolicy" with the appropriate emergency location policy).