From "Site administration > Reports > Security checks", i see a "critical" warning for "Default role for all users" with detail of "The default user role "Authenticated user" is incorrectly defined!".
But when i check, it's well the good role that is defined! And i've tried to reset it (and other default roles) to default permissions with no positive change
I can see this problem on my main Moodle plateform (3.7.6), on another one (3.8.2), and even on Moodle 3.9 QA, and other people see the same thing.
So i think it's a bug in this check! I've seen MDL-50613 (closed), which means this should not indicate "critical" warning.
What do others think?
PS : for french reading people, you can look at this french discussion about this problem.
I had this same problem and your solution fixed it though it does seem like a bug since allowing users to request their data be deleted is a reasonable request. I have submitted a bug report at https://tracker.moodle.org/browse/MDL-69025
Could you please check if your created issue is a duplicate of MDL-67852?
In such a case, please close it and contribute to the original one, so that we get a better chance to have this fixed.