#1034 Syncing problems after migration from Win 10 to Win 11 (new PC)

[Roland Hertert]

Hello,
I have updated from windows 10 to a new PC with windows 11, both PC´s are Asus Zenbooks.

Having an Outlook classic (Office 2021 Pro) and for years I never had problems with the GoContactSync (great product) and after installations on my Win 11 PC, I get following message below. I have the latest GoContactSync installed. This error has never been reported on my Win 10 PC on my last sync and now I get below errors on my first sync on my new Win 11 PC

While syncing the contacts:

Outlook contacts matching with multiple Google contacts have been found (either same email, Mobile, FullName or company) and cannot be synchronized. Please delete or resolve duplicates of:
CNAP Caisse National d'Assurance Pension (cnap@secu.lu, )
Desarrollos Inmobiliarios Fincamira S. L. (, )
Christian Reuter (c.reuter@spuerkeess.lu, )
Font del LLop (info@fdlgolf.es, )

and Calendar:

2025-07-29 11:03:23 | Information | Outlook default time zone: W. Europe Standard Time
2025-07-29 11:03:23 | Information | Google default time zone: Europe/Luxembourg
2025-07-29 11:03:23 | Information | Loading Google appointments...
2025-07-29 11:03:23 | Error | The service calendar has thrown an exception. HttpStatusCode is NotFound. Not Found
2025-07-29 11:03:23 | Error | Sync failed.
2025-07-29 11:03:23 | Information | Reading version number from sf.net...

Thank you very much for your Help

Sincerely, Roland