If your trying to assign a phone number to your user, but you get an error, then click on 'Yes' to go create a block of virtual phone numbers.
What is the Phone Number section?:
Operator Connect - These numbers are imported from Office365 when you login. These only appear because you have already purchased them from your Operator Connect phone carrier. More details what operator connect is here. If you need more, then please reach out to your partner or Operator Connect partner.Calling Plans - These numbers are imported from Office365 when you login. These only appear because you have already purchased them from Microsoft. More details what calling plans are here. If you need more, then please contact your IT administrator to purchase these through the Teams admin portal. In future releases, we will provide this functionality within Trifecta Teams.Direct Routing - These are the phone numbers that you already own. When you have your phone system connected to Microsoft, then you can dial out from your actual phone system phone lines via the Teams client. More details what direct routing is here.