I figured it out!!! Using ur dialer type *#*#726633#*#*. It will say something like show 5G. Then go into your mobile network. It will show use SA network. Hit yeas and ur in!
Same here with band 41. I see 5g pop up when I am on a call but goes back to LTE when I hang up. My 13 pro has no issue picking up band 41. It makes no sense to me