Proactive Out Reach for invalid One Drive URL in O365 Securlet causing quarantine to fail in DLP policy
404 error trying to get to the O365 One-Drive Admin URL. Turns out Client had never accessed the O365 Admin One-Drive URL for the first time himself.
After Client accessed Admin One-Drive URL with Admin creds - no longer getting 404 error, then getting an O365 sign-in prompt.
Client tested and O365 Securlet quarantine was also now successful