Thank you, and thank @BlakeRichardson for your replies. I have solved the issue. The cert was renewed before it expired. The weird problem was that the cert that was in Meraki SM, appeared as if it was being used by our google services in the apple push certificate portal and not by Meraki (which wasn't). Once support told me the original push topic on the original certificate I was able to find the problem and I renewed the correct one.
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