Outlook cannot open a new form on SharePoint Workflow Open this Task buttons

Issue:
Recently a user stated they were getting an error message in Outlook stating "Outlook cannot open a new form. The form contains schema validation errors." when they clicked on the Open this Task button in a SharePoint Task assignment email.

Root Cause:
The user had created an out-of-the-box Approval workflow and inside the Request box had entered several HTML tags like <a href="site">link</a> where the site reference in the href was outside of SharePoint.

Resolution:
While I don't recommend putting HTML tags in the Task assignment emails in workflows, it will work if you reference the same SharePoint site or site collection the Task is coming from.

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