Hello, I have just migrated to NC 29 (.0.8). Since then, it’s impossible to synchronize a contact if a birthday exists. By deleting the birthday, you can synchronize the contact. I’m using cardbook (97.5) - thunderbird(128.4.3esr - 64 bits), on linux. What should I do? Thank you for your suggestions. Best regards, Christian NC 29.0.8 shared hosting : ovhcloud php : 8.2 Base : 10.5.27-MariaDB-deb11-log