This is not a bug. If you no longer receiving gems from this offer, it is probably because you have exceeded the number of times you are able to complete this offer. This limit is 5 completed invitations. So any attempts to redeem more gems after 5 invitations will not return any other rewards.
But don't worry - there are still other options to earn gems: daily rewards and completing other promotional offers like watching videos. Check them out to start earning more gems."
I invited my friends but received 0 gems.
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