Issue with new Samsung Call and Text on other devices feature

I'm having an issue with this new Samsung feature (Call & text on other devices).

Here is a link to the feature: https://www.samsung.com/us/support/answer/ANS00083152/

I have a Samsung Note 10+ and a Samsung Tab S6. Both were purchased from Samsung directly. The Note 10+ is a AT&T variant and the Tab S6 is wifi only.

When I go to "settings" on the Tab S6 and search, I find the option and am able to enable it, however, when I search for the same option on the Note 10+, it's not found. I have attached screenshots from both devices.

I have already contacted Samsung and they said that the option should on the 10+ unless AT&T it blocking it. I'm guessing that perhaps you are blocking it so you can sell your "numbersync" feature but I hope that it not the case. Customers should be fully allowed to exploit the capabilities of the devices that they purchase.

The reason that I did not purchase an "unlocked" phone from Samsung is because the last time I did, "wifi calling" was disabled by AT&T. I was told that customers lose enhanced LTE features and capabilities with unlocked devices.

Please advise  . . .