ANSWER - Judy made a script that runs nightly to add the student's CAMS ID to their AD account. You can also run this script manually.
FOR STAFF - Just add: "Lastname"-access-comevo to extensionAttribute1 in their AD account.
500 error - their server may be down
403 error - refresh the page after logging in. your browser just timed out
Invalid Information error
You will need to add the student's SystemID from CAMS to their AD account.
See images below.