I can't register for an online event

The error message "there is a problem with registration" for an online Microsoft event is typically caused by an issue on the event platform or with how the registration was synchronized, not by Excel or Windows.

For Microsoft Virtual Training Days or similar online events hosted on ON24, a known cause is a synchronization delay between Microsoft’s event management system and the ON24 event registration system. In that situation, the registration doesn’t reach ON24 correctly, so the email address is treated as not registered and registration or login fails.

The documented resolution in such cases is:

1. Contact ON24 support to confirm whether the email address is actually registered for the event.
2. If ON24 confirms the email is not registered due to a sync issue and the event has already taken place, re‑register for the next available instance of that event.
3. If the event is upcoming and registration still fails, contact Microsoft Credentials/Events support so they can check the registration status and, if needed, correct the synchronization.

If the issue is that a confirmation email or join link never arrives after registration appears to succeed, the recommended action is to open a support request with Microsoft Credentials Support so they can verify the registration and resend confirmation details.

For any persistent registration failure, use the Microsoft credentials support channel referenced in the context to get direct assistance from the event/credentials support team.

References:

• Can't log into virtual training day with my registered email address - Microsoft Q&A
• Unable to join Azure Virtual Training Day due to login failure - Microsoft Q&A
• Registration Issue - Confirmation email not received for Microsoft Azure Virtual Training Day - Microsoft Q&A