Add support for workspaces callbacks to MS auth provider

extensions/vscode-account/src/AADHelper.ts

@@ -317,6 +317,10 @@ export class AzureActiveDirectoryService {
 	}
 
 	private getCallbackEnvironment(callbackUri: vscode.Uri): string {
+		if (callbackUri.authority.endsWith('.workspaces.github.com')) {
+			return `${callbackUri.authority},`;
+		}
+
 		switch (callbackUri.authority) {
 			case 'online.visualstudio.com':
 				return 'vso,';