I registered this account in may of 2019, but I never used it.
I came back and tried to register with a better username, but I see now that the registration page has been
corrupted so that it does not allow me to register anymore.
It just says:
"There was a problem with your submission. Please correct the errors below.",
without giving any specifics, even though there were no problems with the fields that I filled out.
I'm lucky that I found the password to this old account, else I would not have been able to post this.
Therefore revert the registration page to its previous, correct version, which existed in may of 2019 and earlier.