I'm getting a 'Permission Denied' message when trying to access a Google Form.

A 'Permission Denied' error means the owner of the Google Form has not granted you access. This could be because the form is set to 'Restricted' or specifically shared with only certain people. Contact the form owner and ask them to share the form with you, either by adding your email address to the list of collaborators or by making the form publicly accessible. Ensure you are using the correct email address that the owner has permission to share with.