5g On AT&T with international version

I’ve got a couple of staff with Samsung Galaxy S21 Ultra phones. We are on AT&T. I can’t get 5G working on these phones. I finally was told what the proper APN settings for 5G are supposed to be, but we can’t get the settings to stick.

Specifically, I can set up a new APN with all the settings except "mnc 410" (no quotes of course). If I try to set that and save the APN either it just doesn’t save or the whole APN disappears. It’s just bizarre.

Any ideas?

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