How to Make Microsoft Intune Client Work Behind Corporate Firewall Proxy. It won’t be much easy to test InTune client functionality on office machines that are connected to cooperate network. Mainly all the communications are through 80 and 443 (HTTP and HTTPS) ports.
You can check the following post that explains Intune Firewall Proxy Requirements Modern Windows 10 Deployment. The connectivity requirements are always updated in Microsoft docs.
How to Make Microsoft Intune Client Work Behind Corporate Firewall Proxy
Microsoft’s blog post suggests to configure or alter firewall and proxy settings to allow Intune server to communicate with the clients. In case, if you’re doing a PoC for Intune, it won’t much easy to get the cooperate firewall and proxy settings changed. The catch is that if your test workstation is behind a proxy server which won’t allow system accounts rather than domain user accounts to access internet site then you won’t be able to test Intune client.
Intune team done a wonderful job to cover all firewall and proxy requirements for Intune client management in one post. More details HERE !!
Required domains for documentation, online Help, and support
Required domains for Microsoft Update Services
Required domains for Windows Intune and related services
Required domains for Windows Update Services
Required proxy server configuration
Side Note :-
However, there are dead links still available if you try to google or bing on this topic.