Invalid email- Firefox Relay Mask

My FF Relay mask is no longer considered a "valid email address" and I can't log into my account.
My browser is Firefox.

I used this email address to sign up and have been using if for years without any issues .

I've tried:

• Logging in with the Relay email,
• Resetting my password,
• Creating a new account and trying to change the email address to the Relay one,
• Logging in from a different browser (Edge),
• Logging in from a private window,
• Manually typing in my email and password,
• Disabling the Bitwarden extension and all other extensions. All extensions are up-to-date,
• Using the "default" (Obtain DNS server address automatically) option under Network Settings,
• I do not use the desktop app

I've gotten the "Enter a valid email" error each time.

I've sent emails to the "invalid" email address and have received them with no issues so this is definitely a NextDNS issue.

I'm ok with creating a new account, but I'd really like to export the my block list so I can upload it to the new account.
Any insight would be appreciated!

Thanks