Oauth Failed for Adobe Sign App in SharePoint Online

I am a SharePoint administrator in our SPO tenant.  I added the Adobe Sign app to our tenant and added the app to a site.  When I try to login to Adobe Sign in the app on the SPO site, I get an "OAuth Failed" error.  I am using an Adobe Sign admin account that is tied to a different email address (not my corporate email address).  The Adobe Sign account is an Enterprise account.  I made sure that I am in the site owners group for the SPO site.  I also added the user name attached to the email address that is attached to the Adobe Sign account.  I am looking for help to get this set up.  Thank you in advance.