Wordpress WP-Rocket regenerate critical css error

I have mod security, aggressive bad bot blocker, csf fail2ban like rule installed and activated on my server.
Recently I changed my server and connected it to a new IP address but now I am not able to regenerate critical CSS on WP-Rocket as it is giving error 400. As I have learned this is happening because some of the security system on my server.
WP-Rocket says to whitelist ip

Code:

167.114.226.142

for regeneration of critical css and I have whitelisted this ip in csf.allow as

Code:

167.114.226.142 # wprocket - Tue Mar 31 16:34:20 2020

and restarted csf and nginx but it didnt worked. Then I commented out mod security and bad bot blocker codes in my domain vhost file and restarted nginx but still it didnt worked.
After some research what I could find was that I need to whitelist my new server IP somewhere so that it could call itself back.
I need help to understand where do I need to whitelist my server IP address as I have whitelisted my new server IP address in bad bot blocker whitelist.conf file but it still not working. Where else do I need to do these?

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Yeah, thanks a lot @eva2000