How to copy the library ID in order to synchronise my files definitively?

Hello dear Community,

I'm trying to sync my OneD with my files on the MAC (OS 12.3) but It's impossible from the app

in "preferences" all is right, I have a space for syncing, but it doesn't work. Only 795Mo on the 365 holding mentioned whereas I have more than 30Go in the OneDrive on the cloud

From the web page, when I click on "sync" I have this message. But in clicking on the link : "copy the library ID" to configure the automatic sync, nothing is happening, the link seems not a link.

It would be very pleasant if anyone could help

In advance, many thanks for your time and help

BR

C.