Obviously the two sets of the seeds you used to recreate the multisig on the the phone would have to be 2 of the 3 used when you created the Mac multisig.
This is not how multi-sig works. You cannot "convert" a 2-of-3 multi-sig in to a 2-of-2 multi-sig by recovering from only 2 out of the 3 seeds. You must use information from all 3 shares, be that hardware wallets, seed phrases, or master public keys.
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Correct!