5g Ultra Wideband support???

Once again, Xfinity advertises that it has 5g Ultrawideband, yet my phone never shows 5g uw

I called into support tonight to inquire, and she did a chat with her higher support and said "we don't not support Ultra Wideband yet".   I even showed her on the website where Xfinity states they have 5g UW.    She replied again that isn't isn't supported at this time.   

Can someone with knowledge actually assist with this?  I don't believe that Support even understand what Ultra Wideband is