unable to connect Chamberlain Liftmaster garage door opener (myQ app) to T-mobile 5G internet

After many tries , my buddy brought over his old Orbi and it worked flawlessly! I tried TPlink Deco S4 and it was not successful after trying every possible scenario. Uggg

One Fix for the win👇
NETGEAR ORBI (RBR20)

I wish TMobile would fix the solution so we wouldn’t have to buy devices to fix the solution. 
 

I also read in another forum that the TMobile Sagemcom 5688 works fine vs the KVD21 , in which I have the KVD21. Which gateway model do you have ?