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There is an error on the page http://docs.telerik.com/platform/backend-services/development/net-sdk/users/update-users
The example code under "Single user" calls ExecuteSync instead of ExecuteAsync. It should be
public
async Task UpdateUserById(EverliveApp app, Guid userId, User updateObject)
{
await app.WorkWith().Users().Update(userId, updateObject).ExecuteAsync();
}