Contact / CardDAV sync with NextCloud does not work anymore

[ervee]

Describe the bug
I recently noticed that new contacts were not available in SnappyMail.

To Reproduce
Steps to reproduce the behavior:

1. If not done already: Go to settings - contacts - enable remote synchronization and set to yes or read only and fill the required fields.
2. Back in the main interface click the contact book. Then click "Synchronization" in the hamburger menu.
3. See error

Expected behavior
No error and successful sync of contacts.

Screenshots

Please complete the following information:

• Browser: Tried multiple, does not matter.
• IMAP daemon: Dovecot
• PHP version: 8.3
• SnappyMail Version: 2.38.2
• Mode: standalone

Debug/logging information
Read here how to log

• I've placed them here (few lines) or as attachments (many lines)
  SnappyMail logs:

Jan  8 16:41:05 #myservername# snappymail: [2025-01-08 15:41:05.198][caaa3df1] PdoAddressBook[WARNING]: Sync() invalid DavClient
Jan  8 16:41:05 #myservername# snappymail: [2025-01-08 15:41:05.199][caaa3df1] SERVICE[WARNING]: ContactsSyncError[140] (AddressBookProvider->Sync() failed)\x0d
Jan  8 16:41:05 #myservername# snappymail: #pathtosnappymail#/snappymail/v/2.38.2/app/libraries/RainLoop/Actions/Contacts.php#75\x0d
Jan  8 16:41:05 #myservername# snappymail: #0 #pathtosnappymail#/snappymail/v/2.38.2/app/libraries/RainLoop/ServiceActions.php(143): RainLoop\Actions->DoContactsSync()
Jan  8 16:41:05 #myservername# snappymail: #1 #pathtosnappymail#/snappymail/v/2.38.2/app/libraries/RainLoop/Service.php(132): RainLoop\ServiceActions->ServiceJson()
Jan  8 16:41:05 #myservername# snappymail: #2 #pathtosnappymail#/snappymail/v/2.38.2/app/libraries/RainLoop/Service.php(14): RainLoop\Service::RunResult()
Jan  8 16:41:05 #myservername# snappymail: #3 #pathtosnappymail#/snappymail/v/2.38.2/include.php(137): RainLoop\Service::Handle()
Jan  8 16:41:05 #myservername# snappymail: #4 #pathtosnappymail#/index.php(11): include('...')
Jan  8 16:41:05 #myservername# snappymail: #5 {main}

Webserver logs:

#mywebserverip# - - [08/Jan/2025:16:41:05 +0100] "PROPFIND /#nextcloudfolder#/remote.php/dav/addressbooks/users/#myuser#/contacts/ HTTP/2.0" 401 535 "-" "SnappyMail/2.38.2"
#mywebserverip# - #myuser# [08/Jan/2025:16:41:05 +0100] "PROPFIND /#nextcloudfolder#/remote.php/dav/addressbooks/users/#myuser#/contacts/ HTTP/2.0" 401 535 "-" "SnappyMail/2.38.2"
#mywebserverip# - - [08/Jan/2025:16:41:05 +0100] "PROPFIND /.well-known/carddav HTTP/2.0" 301 162 "-" "SnappyMail/2.38.2"
#mywebserverip# - - [08/Jan/2025:16:41:05 +0100] "PROPFIND /#nextcloudfolder#/remote.php/dav/ HTTP/2.0" 401 535 "-" "SnappyMail/2.38.2"
#mywebserverip# - #myuser# [08/Jan/2025:16:41:05 +0100] "PROPFIND /#nextcloudfolder#/remote.php/dav/ HTTP/2.0" 401 535 "-" "SnappyMail/2.38.2"
#mywebserverip# - - [08/Jan/2025:16:41:05 +0100] "PROPFIND /#nextcloudfolder#/remote.php/dav/addressbooks/users/#myuser#/contacts/ HTTP/2.0" 401 535 "-" "SnappyMail/2.38.2"
#mywebserverip# - #myuser# [08/Jan/2025:16:41:05 +0100] "PROPFIND /#nextcloudfolder#/remote.php/dav/addressbooks/users/#myuser#/contacts/ HTTP/2.0" 401 535 "-" "SnappyMail/2.38.2"

Additional context
Could be related to #1877