Server error : VCARD components must contain at least 1 FN

[parisni]

One one my card collection refused to sync with the title error. I had to export my contacts to vcf, destroy the colleection and reimport them. Then the error disappeard.

In the vcf file, I have not found any entry without FN.

I don't know what the had this collection specific: notably, it has been shared with a user that has linked its iicloud collection to it.

Note that I tried to remove all contacts from the collection to spot the faulty one. And once I got the collection without any contact, stiill it was complaining about an entry with a missing FN.

Somehow I had a zombie contact