Been looking all over for a solution to this today but @Jaydea 's response worked perfect for me.
And if it helps for everyone else including the Forum team, after I got registered and went to update my password to something stronger the requirements mentioned to create a password between 8-10 characters, with letters and numbers, no spaces and must begin with a letter;

Whereas during registration the password requirements allowed for a longer password, with letters and numbers, but no mention about the first character being a letter. Definitely some sort of mismatch in the password requirements. Hope this helps!