GET https://graph.microsoft.com/beta/external/connections/contosohr/quota
// Code snippets are only available for the latest version. Current version is 5.x
// To initialize your graphClient, see https://learn.microsoft.com/en-us/graph/sdks/create-client?from=snippets&tabs=csharp
var result = await graphClient.External.Connections["{externalConnection-id}"].Quota.GetAsync();
// Code snippets are only available for the latest version. Current version is 6.x
GraphServiceClient graphClient = new GraphServiceClient(requestAdapter);
com.microsoft.graph.models.externalconnectors.ConnectionQuota result = graphClient.external().connections().byExternalConnectionId("{externalConnection-id}").quota().get();