I always got an error at “_realm = await Realm.GetInstanceAsync(new PartitionSyncConfiguration(“test@test.com”, _realmUser));” (See it in Screen Capture)
I have tried it for a week, but it still does not work!!!
But the error you are seeing is that you are trying to connect with a partition-based sync API from the client but your server-side Atlas App Services is configured with Flexible Sync - you’ll want to change it on one side or the other but I’d recommend Flexible Sync as that is the future of Device Sync at MongoDB.