Turns out I have an older account which was set up several years ago.
https://bicycles.stackexchange.com/users/5524/criggie
I do not have access to the email address that would be associated. Is it possible to merge that account with my real one? If not, can it just be deleted? Or should it be left as-is ?
My real account is https://bicycles.stackexchange.com/users/19705/criggie