Because it's quite hot in Germany right now, I did a couple runs, bike tours, hikes etc in well above 22° C, but my Fenix 6 (Software v22.10) didn't show or calculate the heat acclimation - it worked before, but I can't reproduce when it stopped working.
For comparison: my girlfriends Fenix 6s (Software v21.00) it show's around 25% heat acclimation.
What I did/checked for trougbleshooting:
- restart the watch
- the watch is connected to my phone all the time
- the weather shows up on the Fenix
- the Garmin Connect App on my Pixel 6 Pro is permitted to use the exact location all the time