Overview:

Issues occur when approving documents using the SSO feature. When approving a document, a message occurs:  You must validate your eSignature credentials with your corporate single sign-on service to complete this action.

Root Cause:

Some browsers prevent users from completing eSignatures with their SAML Identity Providers through an iFrame. 

Solution:

1. Go to Admin --> Settings --> SAML Profiles.
2. Click the SAML Profile settings.
3. Select Authenticate SAML eSignatures in a pop-up window rather than an iFrame. checkbox.
   
   

Related Documentation:

• Vault Help Documentation:  About eSignature Authentication Context