Hey Robb,
We are sorry for the delay in response to your query.
Looking at the error message shared above, i assume that you recently changed your Adobe ID to a different email address? If yes, then that's the cause of issue.
"The issue arises when the Adobe ID is being changed but the E-Sign account is not automatically updated if there is already an E-Sign account with the new email address"
Try to Signing In through the link shared below-
1- You may refer to Sign In — e-signature and e-sign Software Solution — Adobe Sign
If it works here and you are able to Sign In that means your services are working fine, it just your email not able to sync. You may contact to support following the steps suggested below-
Click on the ? icon at upper right corner, as shown in picture below.

2- It would take you to your support option page.
[You may check the private message where I have shared the contact number and the direct email for Adobe Sign support team.
Adobe Sign contact support]
Regards,
Akanchha