522 error on some networks

I have a vps from ovh.com and a domain i setup the cloudflare correctly and it works but some users get 522 error and some dont, i user IIS 10 win server 2019
i also whitelisted cloudflares IP’s in IP and domains restriction and still no luck
also tried to change the connection time out to highter…
the same user reported that the site sometimes works and the other day it doesnt…
also the same for me when i use 4g on my phone

Found out that my vps has an Firewall to but its disabled…
should i add the IPS there aswell and which protocol should i use?

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