Working for me again as well, thanks to everyone that posted here having issues. I would really like to know what the issue was on their end so when it happens again we can collectively point to that for them to investigate. Thanks!

I'm having the same behavior, seems something with their authentication system.  I saw the behavior with my (legacy) Synology DDNS alerting starting yesterday.  I have tried updating via a couple of dnsomatic containers in Docker and using the Direct...