Can't log in to my account on any device except original iPhone that was used to set up my account.

I signed up for 1 password (family plan) on my iphone. I saved my emergency kit as a pdf.
I am unable to log into my account on any other device besides my iphone. I've double & triple checked my credentials and that i'm logging in to the right (U.S. based) account.

I get this message in a red box every time: "We weren’t able to sign in to your account. Maybe there’s a typo? Check your sign-in details and try again."

I prepaid for a yearly membership. How can I fix this so that I'm actually able to use the product?