With communications with Google developers and our engineers' effort, we discovered the Google Admin API behaved unusually recently, that result in your rules with the User created trigger being disabled unexpectedly.
The error returned from Google Admin API indicated your admin user has lost administrative privileges, but in fact it's not the case. It's caused by technical issues after new Google users are created.
We've updated the User created trigger with a workaround, and will monitor the fix in the upcoming days.
You can re-enable the rules. If you still experience the issue, please follow up this thread.
Thank you again for your feedback and support.