I upgraded to 1Password 8 on my Mac and it is not recognising my master password. 1Password 7 does

I'm having the exact same issue. Any suggestions to resolve this? My iMac was not synching with my other devices so I signed out on the iMac and thought I could sign back to reset the account. Then got the "We weren't able to sign in to your
account. Maybe there's a typo? Check your sign-in details and try again." I know the password and secret key are correct. I can login to 1passowrd.com. I'm on the latest public beta of Mac Ventura and 1password 8.9.6