Gmail Pusher Alias 403 Error
The Gmail Pusher Alias 403 Error occurs when a signature attempt is pushed to an email alias as opposed to the primary email address.
For Example: [[aliasusername]]@opensense.com instead of [[primaryusername]@opensense.com

When the errors occur, a 403 error will show up with the primary email address that the signature could be sent to - [[primaryusername]]@opensense.com. To bypass this error, re-push the signature to this primary email address.
For impacted users: once the admin confirms a successful push, ensure that your primary email address is selected in your signature settings as well:

Reach out to help@opensense.com with any concerns or questions to find the best resolution.