Garmin Express synchronisation error

Since a week or so (I think after the new garmin express update 7.29.1.0) when I plug in my Forerunner 25 (v3.4) with the usb cable, using windows 11, and open it in Garmin Express it shows a red banner with 'synchronisation error with garmin connect'. I uninstalled and reinstalled garmin express, installed it on a different laptop, deleted the upload history, but the only way I can upload my activities is to use my old laptop (with the software update before 7.29.1.0). Can I resolve this myself or is this a software problem? Thanks in advance!