Hi @Wächter André ,
Thank you for posting in this community.
Configure Trusted Locations in Office:
- Open the Office application (e.g., Access).
- Go to File > Options.
- Select Trust Center > Trust Center Settings.
- Click on Trusted Locations.
- Click Add new location.
- Enter the path to your SharePoint Online Document Library.
- Check the option Subfolders of this location are also trusted if needed.
- Click OK to save the settings.
Reference: https://learn.microsoft.com/en-us/microsoft-365-apps/security/trusted-locations#planning-steps-for-trusted-locations
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