First of all I would like to say a big thank you for your interest in this case.
It is very nice to see that someone from the EA team is trying to help.
I have tried resetting my Google Ad ID, but the result is always the same.
I was lucky enough to get the rewards two times, but I have another 14 failed attempts!
Note that I keep track of my tries today, since the problem that has been troubling me for 3-4 days made me loose many W's points and tokens of the Monthly Masters campaign & the Influencers campaign, as well as too much stamina that I could have used to progress in my game.
I can only hope that the EA Team will send some compensation, so that those campaigns will not be a waste of time...