User agent blocking not taking effect

I configured a user agent blocking based on the UA I see in my nginx logs but it’s not taking effect. I know the attacker is coming through because when I activated the under attack mode the attack stopped but then it stops working to everyone given that my app cannot properly present the challenge to the users.

Why is it not working?

UA: Mozilla/5.0 (Windows NT 6.3; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/72.0.3626.109 Safari/537.36

Okay, after a while it started working, it took approximately 30 minutes.

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