Hi @Pineda-Montes Jose-Antonio ,
Welcome to the Microsoft Q&A Platform. Thank you for reaching out & I hope you are doing well.
I understand that you would like to enable the exclusion rule 900130 in App Gateway WAF.
I am afraid that I did not quite catch your question.
In App Gateway WAF, Exclusions are not configured the same way as Rules are.
You should use a request attribute and set an exclusion.
Refer: Web Application Firewall exclusion lists
This document provides the list of rules available in WAF using OWASP 3.2
App gateway CRS Rules
I do not see Rule 900130 listed here.
In this case where you encounter a large number of false positives, the ideal way to get around this is by using Custom Rules and allow your requests using a matchVariable
Let me know if you have any queries on the above.
Cheers,
Kapil