How to get a user from an IGraphServiceClient object? - asp.net-core

Question

I have a POST method and want to get a user from an IGraphServiceClient object (in the Graph.Microsoft package and namespace).
The GET method works fine. Then I take a user from this list and set them as a parameter for my POST method.
public async Task<Dictionary<string, List<string>>> GetUserGroupsAsync(ICollection<string> userIds)
{
var aggregatedUserGroupMap = new Dictionary<string, List<string>>();
foreach (string userId in userIds)
{
try
{
var userMemberOfCollectionRequest = graphServiceClient.Users[userId].MemberOf.Request();
var userMemberOfCollection = await userMemberOfCollectionRequest.GetAsync().ConfigureAwait(false);
if (!aggregatedUserGroupMap.ContainsKey(userId)) { aggregatedUserGroupMap.Add(userId, new List<string>()); }
foreach (var memberOf in userMemberOfCollection) { aggregatedUserGroupMap[userId].Add(memberOf.Id); }
}
catch (Exception ex)
{
throw ex;
}
}
return aggregatedUserGroupMap;
}
The values in the incoming string collection, userIds, are user email addresses, copied from the GET result.
The value of userMemberOfCollectionRequest looks fine. The RequestUrl property contains "https://graph.microsoft.com:443/v1.0/users/my-email#compagny.com/memberOf". Headers and QueryOptions are empty collections.
In the above method, the following line throws an exception:
var userMemberOfCollection = await userMemberOfCollectionRequest.GetAsync().ConfigureAwait(false);
The exception message reads:
Request_ResourceNotFound
Resource 'my-email#compagny.com' does not exist or one of its queried reference-property objects are not present.
at Microsoft.Graph.HttpProvider.SendAsync(HttpRequestMessage request, HttpCompletionOption completionOption, CancellationToken cancellationToken)
at Microsoft.Graph.BaseRequest.SendRequestAsync(Object serializableObject, CancellationToken cancellationToken, HttpCompletionOption completionOption)
at Microsoft.Graph.BaseRequest.SendAsync[T](Object serializableObject, CancellationToken cancellationToken, HttpCompletionOption completionOption)
at Microsoft.Graph.UserMemberOfCollectionWithReferencesRequest.GetAsync(CancellationToken cancellationToken)
at xxx.xxx.BusinessComponent.GraphBC.GetUserGroupsAsync(ICollection`1 userIds) in C:\workspace\xxx\xxx.xxx\xxx.xxx.Core\BusinessComponent\GraphBC.cs:line 50
Does anyone have an idea for where I should look to solve this problem?

Answer 1

The solution was not to use the email, instead using the ObjectId property (a GUID instead of an email).