There is Authentication Error “URL can be used only once”, while clicking the Blocked email received. This link works file, if i use gmail, but gives error, when i use outlook. Although, despite getting error “Authentication error”, Account is being unblocked.
It could be due to security scanner that i can infer from this link: Brute-Force Unblock Link in Emails Consumed by Security Scanners
But, do we have any fix yet, as it is really be a bad user experience.