Mike thanks for a suggestion. Apparently my ant+ donge (Magene) does not transmitt correctly data back to the trainer. I used Zwift Companion on the smartphone as an interface and it worked perfectly today:-)
Solution: I need buy a better ant+ dong. Will be gratefull for any suggestion on a reasonable brand (not for millions of coins :-)). br Tom
I’ve been using this one for a few years now
USB ANT+ Stick an Adapter for… https://www.amazon.com/dp/B079217ZGV?ref=ppx_pop_mob_ap_share
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thx a lot.