Automated Detection and Response for Azure WAF with Sentinel runs with errors

Good afternoon,

I have been trying to trigger an automated response from Sentinel using the admin guide in Github.

https://techcommunity.microsoft.com/t5/azure-network-security-blog/automated-detection-and-response-for-azure-waf-with-sentinel/ba-p/3692525

I believe that I have followed the guide correctly (I have actually redone it twice).

Following this guide I have created a custom Analytics rule which should read my Front Door WAF log, retrieve the IP addresses which have been blocked and add an entry to my WAF custome rules with the detected IP addresses.

This is the query:

AzureDiagnostics
| where Category == "FrontDoorWebApplicationFirewallLog"
| where action_s == "Block"
| summarize RequestCount = count() by clientIP_s, host_s, action_s, Resource
| top 20 by RequestCount 
| order by RequestCount desc

The Automated workbook gets triggered without error but the Run always failed to run to the end. An error is triggered when the Logic app reach the step "Check WAF Type".

Given that I use a Front Door app, this step should return True but it keeps failing by return false.

I have been spending a lot of time trying to figure this out but without sucess.

Would anyone have any idea?

Thanks a lot