Huawei mate 20 pro no syncing

Hi all,
If you could help out I’d be really grateful. I’m probably being a total plonker, so hopefully it’s an easy fix. I have a mate 20 pro, running with an ant+Dongle. Whenever I go on the pair device screen, the ant and Bluetooth symbols are flashing, but it won’t find or pair to my Tacx Flow. It all works fine on Rouvy, but I’d like to start riding on Zwift. Any help would be much appreciated.