If I set
CSRF_TRUSTED_ORIGINS = ['https://example.ddns.net/']I get “502 Bad Gateway nginx/1.18.0”.
According to the upgrade docs, this should be the correct one… Have you tried to leave out the last trailing “/” after the domain, by chance? Just an idea… my own installation is still pending the update from 10.0.1, so I will perhaps have more experience in a few days.