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one of the remaining active vPC member ports

From

Cover of CCNA Data Center DCICT 640-916 Official Cert Guide

Note

Coming in from up onto the switch that has all the vpc members ports disabled and only vpc peer-link is functioning. So to send it to the orphan (only 1 vpc port) downstream device it will send it across the vpc peer-link and the receiving switch will send it to the downstream orphan device