Assuming, the user profiles are maintained and contain the manager for every user, getting the manager with some CSOM code is simple.


PeopleManager peopleManager = new PeopleManager(ctx);

ClientResult<string> p = peopleManager.GetUserProfilePropertyFor(accountName, "Manager");

ctx.ExecuteQueryRetry();

The manager could be read from p.Value in the code above. The important part in this snippet is the notation of the accountName. It must be “i:0#.f|membership|username@domain”. The code above will return the manager with the same notation.

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