Sleep skin temperature not working, what's the problem?

I have the same issue, i've been wearing the watch for about a week now but there are no skin temperature recordings showing up. The SkinTemp folder on the watch is empty.

Firmware Version is 13.71 but had the same problem with the older firmware version.

Yes, the same problem with me. Yesterday software update to 13.71 but still no skin temperature at night. First thought it was because I connected two watches in the app but also after removing it and although I set the Tactix 8 as a priority no solution to the problem.

Just a question - is your Tactix 8 set as you Primary Wearable Device? If you happen to own another watch, and did not explicitly enable the Tactix 8 as the PWD, it won't display the skin temperature changes:

What Is the Skin Temperature Feature in Garmin Connect? | Garmin Customer Support

NOTE: The watch will need to be your primary wearable to display the temperature changes. See Garmin Connect: Setting a Watch as Your Primary Wearable Device to set it properly.

I have it as the primary and currently only watch active in the app. Still not possible.

Mine doesn't record skin temp at night either TACTIX 8 AMOLED 51mm on version 13.71

I have the same problem, i'm wearing the watch constantly since over a week and all i get in the skin temp is"--".. Strange

Mine is not showing either but I’m pretty sure it’s not something that syncs over from the last device and will need 3 weeks to calibrate

I have the Tactix 8 Amoled and the sleep temperature is not displayed for me either. On the connect mobile app in the field "Avg Skin Temp Change" has "--" displayed instead. 

I have the new Tactix 8 Amoled and the sleep temperature isn't displayed for me either. It is my only Garmin device and in the connect app in the field "Avg Skin Temp Change" has "--" displayed instead. 

I've only had my watch for a couple of days, so I'll monitor it and provide an update if the temperature eventually begins to register. On that note, how many of you actively track your skin temperature, and what motivates you to do so? I'm curious because it's not something I've ever considered incorporating into my routines, regardless of the activity I'm engaged in (e.g., cycling, running, or weightlifting).