Toorx mirage c80 + trx appgate 3.0. windows/android

the readmill is sold as compatible but in fact the app connects to bluetooth but does not work.

I would suggest you reach out to the manufacturer directly. While their website claims it is compatible with Zwift that brand is not listed as a supported treadmill by Zwift. You can find which treadmills are officially supported by Zwift here.