This isn’t a formal bug request on Obsidian itself, but rather your website.
I bought a catalyst personal licence earlier today and created an account on your main website in the process.
Now, I could log into www.obsidian.md with said account, but I could not log into the forum. So, I tried creating a new account on your forum, with the same email account.
However, it doesn’t seem to have associated the two. As I’m not shown as a supporter when posting in here.