Hi Julien-4124,
Thanks for your posting on Q&A.
In my opinion, the first synchronization with Microsoft Update or your upstream servers does take some time. The length of the synchronization depends on the number of products, update classifications, and languages you have selected, as well as the speed of your Internet connection.
As a best practice, clear all classifications before we synchronize for the first time. After the initial synchronization, select the desired classifications, and then rerun synchronization.
Hope the above will be helpful.
Regards,
Rita
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