Hi @IBN
I had this issue a few days ago. Check the users policies. Make sure that they have a dial plan and voice route applied. Assuming you using direct routing.
Also make sure that the user is enabled for enterprise voice.
Inbound is working as the number is assigned to the user and the telco will send it to teams and teams will route to the user. If the user does not have a route outbound it wont be able to route the call.
Regards,
T