Hearthstone battlegrounds invite issues

I cannot invite my friend to hearthstone battlegrounds even though our ratting scores are well below 10,000 (as it was changed in the recent patch)

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Are you both on the same version of the software? A patch was released yesterday, mobile stores might have a delay of a few hours to a day before the update is made available there, so if you do not have the same version, then challenges, parties, etc. would not be available.