Unable to add a ressource to Zotero

I tried to add a pdf to Zotero from Google Scholar but it fails et it asks if Zotero is running. Zotero is in fact running, the connector in Firefox is there also.
I work under Windows 10 and Microsoft Word 365. I've added Zotero.dotm and Zotero successfully appears in Word.

Thank you for your help.
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