This was frustrating. Didn't notice it in the newletter, didn't see any posts even on reddit...
No warning that if you have capitals in your email address, (like I usually type it out) then logging in probably won't work. At least didn't for me. I changed to all lowercase letters with my email after a password reset, auto generated by chrome, and it finally let me in.
Hopefully others find this useful. Or unRaid can add a "tolower" in their code.
FYI, more prominent "Contact Us" would have been helpful, even just an email address.