Rivian support in multiple channels said it wouldn't work, and after having dealt with what seemed like a scam in the market place with someone taking advantage of the lack of R1T Gen2 Fobs I decided to try out an R1S fob which has been mostly in stock. So for science I decided to try to pair...
"It worked! The only question I had with the R1S FOB and the R1T was if the R1S fob would drop the gate, and it did no problem. I’m thinking for cost saving and ease of production they all have the same internals. Might be worth a go to buy the R1T FOB for the R1S, you can always return it for...
Seems to be a discussion on Reddit where someone ended up pairing a R1S Gen2 to their R1T and the trunk button worked for the tailgate.
Just placed an order for one of the avail R1S Gen2 fobs and I can report back.