What are the Proxy Settings Required for SphereShield for MS Teams?

function FindProxyForURL(url, host) {
	
	var ignorelist = new Array(
		"secure.aadcdn.microsoftonline-p.com",
		"statics.teams.microsoft.com");
	
	var proxylist = new Array(
			"^[^.]+.sharepoint.com",
			"^[^.]+.sharepointonline.com",
			"teams.microsoft.com",
			"^[^.]+.teams.microsoft.com",
			"^[^.]+.ng.msg.teams.microsoft.com",
		        "pipe.skype.com",
			"^[^.]+.notifications.teams.microsoft.com",
			"^[^.]+.asyncgw.teams.microsoft.com",
			"^[^.]+.agatskype.net",
			"^[^.]+.msgapi.teams.microsoft.com"
			);
			
	// Check if need to ignore
	for (var i = 0; i < ignorelist.length; i++) {
		var value = ignorelist[i];
		if (dnsDomainIs(host, value)) {
			return "DIRECT";
		}
	}
	
	// Return our proxy name for matched domains/hosts
	for (var i = 0; i < proxylist.length; i++) {
		var value = proxylist[i];
		if (shExpMatch(host, value)) {
			return "PROXY <**** BASTION SERVER IP ****>";
		}
	}

	return "DIRECT";
}

You should configure your machines to use these proxy settings. It could be configured using Proxy chaining or a PAC file.

If you are using the PAC file make sure it is placed on a web server.