I have a member/patron whose living husband has two separate PIDs. What is the best way to merge or otherwise resolve this problem?
It is 'Brett', again.
Do you mean, that the "Living" Husband, has two (x2) separate 'FamilySearch Person Identifiers" (PIDs), in the "Private Spaces", of their OWN 'FamilySearch' Account?
[ ie, That can ONLY be 'seen' by the "Living" Husband ... ]
Do you simply mean, that the "Living" Husband, has two (x2) separate 'FamilySearch Person Identifiers" (PIDs), in the "Family Tree", of 'FamilySearch'?
[ ie. Where, one is in the 'FamilySearch' Account of the "Living" Husband; and, the other is in (for example) the 'FamilySearch' Account of the Wife ... ]
The reason, that I ask the question(s), is that the 'Answer', has a bearing on the 'Answer' to your 'Question'.
Brett is correct. There are 2 possible scenarios. Hopefully one of the scenarios below answers your question.
Living people are kept in the private space of the person who adds them. No one else can see them or search for them. (see article below - "Privacy in Family Tree")
If he has 2 IDs for himself in his private space, he will need to merge them using the "merge by ID: tool. (See article below - "Merge duplicates by ID number in Family Tree")
If the husband has one ID on his tree and the wife has a different ID on her tree, this is correct. Because living people are private, she has to add him to her account and the IDs will not match. This is true for any living person on the tree. (see article above - Privacy in Family Tree")