"Cannot find Annature user for 'user's email address" when sending a document for signature with Annature

Issue
When sending a document for signing with Annature, using the Signature button, I get the error "Cannot find Annature user for 'user's email address".

Cause
This is due to the following:

• When the connection to Annature was made, this was set up with Assign documents to individual users switch to "On" and the user sending the document does not have an Annature account.

Solution
Refer to Integration with Annature check if the integration is set using Assign documents to individual users switched to "On". If this is, ensure the user sending the document has an Annature account.