Subscription Transfer not working

Hello,

I have an Android app and I have this issue with transferring subscription. My app initially purchases a subscription as an anonymous user and then later on the users can bind this subscription to their email. To do so I use the login function of the SDK, however, while the server callback returns successfully and it passes, when I try to access the entitlements info it always fails ( nothing is found). When you try again with the anonymous user, the entitlements are there which I assume means the subscription has not been transferred, 

I’ve also tested with listening for the UpdatedPurchaserInfoListener but I don’t receive any callbacks.
I’m using v3.3. 

Is this kind of a deprecation bug( now that v3.4 is out), or am I missing something here?