Why isn't ProWritingAid working in Google Docs?

The Google Docs add-on uses your email address to link your premium version. 

Make sure that the email address on your ProWritingAid account is the same email address that  you are using in Google Docs. If not, click the link below to change the email address associated with your ProWritingAid account.

https://prowritingaid.com/en/Account/Manage