Group library invisible on Zotero app

From the Zotero app, I created a new private group to share a library. It redirected me to the Zotero webpage where I completed it. But now, it seems that my Zotero app isn't synchronizing with the webpage, because I'm unable to see the new group in the "Shared Libraries" tab, even if I checked the latest upgrade.
Could someone have an explanation/solution ?
Thanks !
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