GFCI in Multiwire Branch Circuit

Your pigtailing the line side of the gfi? Correct? Load side, they will need to be separate. Two pole afci shouldn’t make a difference.
Pigtailing the neutral in the junction box of first GFCI so that the neutral reaching the second GFCI is completely disassociated from the first GFCI - no connections on load side of first GFCI.
 
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