Processus dans Microsoft 365 pour configurer des applications Office, entrer des clés de produit et activer des licences.
Could you please confirm which Office application you're using (Word, Excel, or another application) and whether this happens with every document or only one? Also, when you open File > Account, does your Microsoft account appear under User Information, and is Office shown as activated under Product Information? If possible, please share a screenshot of this page and indicate exactly where "Microsoft Account" appears in your document, hiding any personal information. This will help determine whether Office is failing to authenticate or whether the problem is specifically related to the document's author information.