We're going to deprecate Session.Error in favour of using SyncConfigurationBase to handle all the session errors. Our unit tests and integration tests rely on Session.Error, so we should rework them. I'm specifically talking about SynceTestHelpers.WaitForSessionError and SynceTestHelpers.RunBaasTestAsync. There's likely more, so more usages need to be searched. Just make sure not to touch the integration tests in SessionTets that end with *_Coexistence, as those are meant to use Session.Error until deprecation.