If you have enabled SSO for your organization’s subscription but cannot use it to sign in to your admin account, please sign in using this link instead: www.grammarly.com/signin?ssoRedirect=false
This link will allow you to sign in to your admin account without SSO. You can then assign the admin role to the correct account as described in this article: Transfer the admin role to a team member
If you also need to update your SSO configuration on the Authentication page without additional verification, sign in again using this link: www.grammarly.com/signin?ssoRedirect=false&secureLogin=true