Galaxy A51 and Visual Voicemail

I switched over to Xfinity Moble ~ 3 weeks ago and bought the Galaxy A51. Have not been able to get Visual Voicemail to work. Called Customer Service and was told it's not supported with the A51.

My wife switched over to Xfinity Mobile and got the exact same phone--Galaxy A51. Visual Voicemail works just fine on her phone - exact same mode phone, exact same SW version of Visual Voicemail. 

So, what am I missing here? How can this be explained and how can I resolve it?

Appreciate any help!