Echo’ing @JohnK comment.
Can you please run your next couple of workouts just running your SUF workouts without attaching to Zwift and let us know?
In the meantime - can you screenshot the double dongle setup?
- one screenshot of the Zwift connections page once it’s up and running
- one screenshot of the SUF connections page once the workout is up and running
FWIW - it is possible to have four apps running. One on BT, one using DIRCON (recommend that !!), with two just reading from two ANT dongles
And I have some experience of the double dongle setups myself and one thing I now try and avoid is letting Zwift have any control of anything. It’s quite ‘grabby’ in my experience.
I assume that you are using the FE-C connection for SUF and the basic PWR reading for Zwift? Is that right?