Hi!
We found a bug in the agent bakery that leads to invalid signatures. We fix it with Werk #14608, so stay tuned for Checkmk 2.1.0p10 - It will be released soon.
The observed bug somehow doesn’t fit to the behavior reported by @msommer, but let’s see if this will be fixed.
Also, there will be the possibility to activate logging for the agent bakery, see Werk #14606 - If signatures are still missing after the fix from Werk #14608, the logfile may be worth a look, as a warning will be written if the bakery fails to sign an agent.