Help with Kids Apples Watch Phone Number

We bought both of our kids Apple watches and they each have their own line through Verizon. When I set up my son’s I had no issues. He can call and text and it shows it’s coming from his phone number. When I set up my daughters it shows her messages coming from her iCloud email. When I check the info on her phone in settings, it says she has the same phone number as my son. She should have her own and I cannot figure out how to get the watch to use her phone number instead of email.