If you are using Zendesk's IP Restrictions this article is for you. If you are not sure, please open:
Admin Center > Account > Security > Advanced
I use an IP whitelist for my API access, what are your IP addresses?
You must add all our server's IP addresses:
3.82.57.172 52.206.12.163 54.242.179.158 54.227.71.163 54.210.38.6 54.175.245.19 54.91.151.138 3.89.231.123 54.198.12.127 23.22.209.116 54.242.227.193 52.91.7.147 3.94.98.15
Note: using an IP whitelist is not recommended as our IP addresses change from time to time and this will stop the apps from functioning correctly. To be notified when our IP addresses change, please follow this article (requires logging into this help center).