are you using the same device for both TR and RGT? i had issues as well when i used just one device. I’ve since moved TR to an ipad (running on BT for trainer control, HR) and RGT on my laptop with ant+ to connect to my trainer (power and HR).
kinda annoying that i have to use 3 devices, but it was pretty much similar when i last tried to use zwift and TR at the same time over a year ago.