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well, I do have exactly the same problem.
DNS-01 with Cloudflare
OPNsense 22.7.4
manual renewal works, automatic fails with the same error message

Dear all

After searching a manageble solution for analysing firwall logs on my homegrown OPNSense, I picked up a lot of ideas from the community and build a solution, based on docker containers and graylog, that is supposed to be easy installable with some basic IT Know-How. It could be the starting point for someone not willing to dig deep into elasticsearch or graylog configuration, but to get nice and usable results with minimal effort.

I called the project "GraySense" and the very first version could be found here:

https://gitlab.com/thetagamma11/greysense

Basically it's just a snapshot of a working environment with a compose file and a Graylog ContentPack. The most  further effort will probably go the the README, as this is the crucial part to make it reproducable for starters (like I was some weeks before ;-) )

I'd be happy if you find it useful an would appreciate ramblings, critics, suggestions and commits :-)

Best
Theta