Please sniff on port 20 000 on your SOGo server using tcpflow and confirm no UID is sent.

I did the tcpflow dump and it shows that there's no UID:

<?xml version="1.0" encoding="utf-8"?>
<D:multistatus xmlns:D="DAV:" xmlns:C="urn:ietf:params:xml:ns:carddav"><D:response><D:href>/SOGo/dav/bongo/Contacts/personal/6651-4FCD1D00-22D-**</D:href><D:propstat><D:prop><C:address-data>BEGIN:VCARD
VERSION:3.0
X-EVOLUTION-FILE-AS:Doe\, John
NOTE:BIRTHDAY=19790101
N:Doe;John;;;
FN:Matthieu Moreau
URL:
TITLE:
ROLE:
X-EVOLUTION-MANAGER:
X-EVOLUTION-ASSISTANT:
NICKNAME:
BDAY:1979-01-01
X-EVOLUTION-SPOUSE:
X-EVOLUTION-BLOG-URL:
CALURI:
FBURL:
X-EVOLUTION-VIDEO-URL:
X-MOZILLA-HTML:FALSE
END:VCARD</C:address-data>

.....

FTR: the VCard in the description was created by an ancient Version of CardDAV-Sync. Recent versions always add a UID before uploading a new contact.

I can still reproduce the behaviour with the latest nightly 3.2.0.20161004-1 and 3.2.0.20161010-1

Okay, since that does not seem to be fixed for now, I helped myself with fixing the VCF files myself.

For the interested:

• Mount your WebDav Contacts Folder in your Filesystem (path like https://sogo.example.com/SOGo/dav/bongo/Contacts/)
• cd to that folder
• apply the following script in that folder (bash 4.x needed)

#!/bin/bash

for card in ls **/*; do

grep -i "^UID:" $card > /dev/null
if [ $? -ne 0 ];then
echo "###################"
#cat $card
echo $card
echo adding uid to card
echo "UID:"$(uuidgen) # >> $card
echo "####################"
fi

done

Uploaded cards will always have a UID.

Old cards can be fixed manually, it was a bug in CardDAV-Sync.