Hello Kevin Weslowski,
Thanks for your question.
It could be for a number of reasons. For detailed troubleshooting, I would recommend you review the documentation below:
https://learn.microsoft.com/en-us/azure/azure-monitor/alerts/alerts-troubleshoot
After doing this, proceed to test the steps again on another user.
You can mark it 'Accept Answer' and 'Upvote' if this helped you
Regards,
Abiola