Hello Andrey,

Below is message from support team and my followup reply for them:
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Support Team :
Hi Andrey,

The account you are referring to is a wireline account Nano Telecom in sandbox,hence the error.
Please advise if you would like me to set up a seperate wireless sandbox account ‘Nano telecom-CMRS’ or do you want me to enable the ‘wireless’ feature on the existing sandbox account?
Regards,
Jabeen Fatima

My Reply:
Hello Team,

Thanks for the reply,

I would love if you make a separate wireless sandbox account with Nano telecom-CMRS