Hi @alejandro_contreras,

 

please have a look at this thread. 

https://gorovian.000webhostapp.com/?exam=t5/Microsoft-Teams/Unable-to-assign-service-number-to-a-resource...

 

It seems like your problem is pretty close and maybe the solutions offered may help you. It seems like there is a problem with assigning phone numbers to ressource accounts created in teams portal. Give it a try using powershell module as mentioned in the thread listed above.

 

Sven

www.000webhost.com