Mobile Compatibility with NumberBarn numbers

I recently added a mobile line on Xfinity Mobile with a new phone number. I was told by support there was no way to select that number but it was assigned according to billing address. I was also unable to see what the assigned number was prior to activating the line. 

The number assigned is a complete dud.  An area code from another city and county with seven random-[Edited: "Profanity"] digits. I can't start using this number because I don't want to get stuck with it.

A solution I found was choosing and buying a number via NumberBarn and then porting it over. Unfortunately, while the NumberBarn FAQ on Xfinity Mobile does say it's possible to port over a number, it is uncertain this is possible in all cases and refers readers to Xfinity for confirmation.

I cannot find anything on the Xfinity Help site about this and chat assistants -- both AI and Live -- didn't have answers.

Can anyone help me out with some information about whether it's possible to port a number from NumberBarn to an existing mobile account?

Thanks!