Why two separate photos beat one group selfie
One photo of both of you usually fails: the AI has to decide who is who, and small faces make that worse. Two separate pictures give each person a clear look of their own. They do not need to be taken together, or even on the same day, so friends in different cities can still do it.
Crop each picture to one person. If your only photo of a friend is from a group shot, crop a copy around their face and shoulders.
Who to cast in each role
The person on the table is the one who gets laughed at, so choose accordingly. Popular pairings: the friend who always claims to know the best coffee spots on the table, with you as the calm regular. A couple, where one quietly shows the other how the furniture works. An older sibling on the table, a younger sibling walking in.
Get a yes before you upload. Both people need to be adults who agreed to appear, and neither can be a celebrity or public figure.
If the two people get mixed up
Check the order first: photo 1 on the table, photo 2 on the bench. If the order is right and the people still blur together, use photos with different lighting and clear front-facing angles, and render again. Failed renders return their credits, but a completed clip you dislike uses them, so check your photos first.