To enable users via Operator Connect, you must first establish a location for emergency services, as Microsoft requires a validated emergency address to be associated with every phone number. Once the address is set up, you "acquire" (upload/sync) the numbers from your chosen operator into the Teams tenant. Finally, you assign these numbers to the specific users.

While Set-CsUser can be used via PowerShell for provisioning, it is not a required step when performing the task through the Microsoft Teams admin center as described in the prompt. The New-CsHybridTelephoneNumber and New-CsOnlineNumberPortInOrder cmdlets are used for Direct Routing and manual porting, respectively, rather than the Operator Connect workflow.

Microsoft Learn: Set up Operator Connect. Section: "Set up emergency addresses."

Microsoft Learn: Manage phone numbers for users. Section: "Assign an emergency address and a phone number to a user."

Microsoft Docs (Teams): Plan for Operator Connect. Document ID: "teams-phone-operator-connect-configure."

Microsoft PowerShell Documentation: Set-CsPhoneNumberAssignment (Note: This has largely replaced legacy cmdlets like Set-CsUser for phone assignments in modern Teams environments).