Realm adding a Partition

I have been working on a Xamarin program for what seems like forever! I setelled on Realm/MongoDB because of how good I feel the Sync support is? They have some good examples on how to use Realm Sync in a Xamarin app right up until you need to add a Partition to limit the downloaded records. Then not so much. I have looked all over the Internet and can not find a good example? Does anyone have access to a good example of Partitions in Realm?

The offending line of code I’m sure is the following: var config = new PartitionSyncConfiguration(_partition, _user);

I think I’m setting the _partition right, certainly has the value of the userID which is what the partition is based on?