Can't copy Sealing to Spouse ordinance in Legacy FamilySearch - No arrows

When adding ordinance information for the sealing of spouses, the spouse in the Legacy family file must first be linked/matched to the spouse at FamilySearch. You can tell that the spouse is not linked because there will be no FamilySearch ID for the spouse on the Legacy side of the Share tab and there will be no arrows for the Sealing to Spouse on the FamilySearch side. Once the Spouse on the Legacy side is matched/linked the arrows will appear.

If the spouse on the Legacy side of the Share tab has a different FamilySearch ID than the spouse on the FamilySearch side, and they are the same person, unlink the spouse on the Legacy side. To do this click on the transfer arrow button by their name on the Legacy side and select Unlink from the popup screen. Next relink/match them to the spouse on the FamilySearch side. Now you can copy the Sealing to Spouse ordinance to your Legacy person.

Also check to make sure that the list of Legacy persons on the left side of the screen is showing everyone. Remove any filters you have set and then click the Refresh button in the Current Filter area at the top of the Legacy persons list.