Passwordless token is already used

PROBLEM Once enabling passwordless authentication, the below error is shown.

SITUATION If you're on M365 environment, Safelink protection is interfering with the passwordless procedure. SOLUTION You have to add a transport rule un order to skip Safelink protection.

1. login into page https://admin.exchange.microsoft.com
2. Apply the rule if the sender IP address is <ESG IP>
3. Do the following: modify the message properties -> set message header -> X-MS-Exchange-Organization-SkipSafeLinksProcessing:1 (with value 1)