Dont have Wahoo, but try this
Update CORE firmware to latest version througth the app
Reset CORE with the cable magnet
Pair with Wahoo as a Ant+ muscle oxygen sensor Thb
thanks, now i have both Oxygen and Temperature sensors connected.
I think from the next workout it should be fine, but for this one it doesnt work even reloading the activity
How are you syncing the .fit file to intervals.icu, through 3rd party like Strava, or direct upload?
Do you have the Core temp and Skin temp Charts selected in the intervals UI?
It looks like the original .fit file has Core temp column, so the file is fine. But maybe the Core temp column got removed by Strava or some other 3rd party …
i use it just to check the Delta T° more than the absolute value, during the summer you can check how much you are adapted and able to selfregulate the internal T°.