I would also not suggest using the exact company name/URL in the email address used to sign up. One time I couldn't log in to my password manager service and af

I would also not suggest using the exact company name/URL in the email address used to sign up. One time I couldn't log in to my password manager service and after a _lot_ of back and forth it turned out that after some years my email was somehow scraped from their DB for using their domain name in my email... So now I always go with something obscure but still traceable back to the service it was used for.