I am trying to navigate to the sign up page at https://api.einstein.ai/signup - it brings me to the page to sign up using salesforce.  I am clicking on the sign up using Salesforce.
I click on the Allow access - and get "An error occured while serving your request" email already registered. 

Please help!

I am trying to navigate to the sign up page at https://api.einstein.ai/signup - it brings me to the page to sign up using salesforce.  I am clicking on the sign up using Salesforce.
I click on the Allow access - and get "An error occured while serving your request" email already registered. 

Please help!