Approval Link: Invalid Key : Key could have been changed manually or would have been an old one.

Approval Link: Invalid Key : Key could have been changed manually or would have been an old one.

I am trying to send approvals to a distribution group so that any member of it can click the link to approve a request, but users get the following error when clicking the $ApprovalLink:

Invalid Key : Key could have been changed manually or would have been an old one.

Is there any way to get this to work, or can approvals only be sent to one SDP user at a time? I did try creating a local user and assigning it the distribution group email and adding it to an Organization Role, but get the same error.
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