A group of Microsoft Products and technologies used for sharing and managing content, knowledge, and applications.
Dear Max Visscher,
I’m sorry for the frustrating experience you’ve had trying to get assistance.
Based on error 530032 and the message indicating that the organization “restricts at-risk users,” this appears to be related to Microsoft Entra ID Protection rather than the SharePoint folder permission itself.
Since the issue occurs when you access a resource shared by another organization, please contact the IT administrator of the organization that shared the folder with you and ask them to review the access restriction from their side.
Their IT administrator can review the applicable Microsoft Entra ID Protection and Conditional Access configuration and determine the appropriate remediation or access action. Microsoft Entra supports risk-based policies for B2B guest users, which can result in guest access being blocked.
For more reference:
After their IT administrator has reviewed and addressed the issue, please try accessing the SharePoint folder again.
Thanks for your patience and understanding so far. Looking forward to your response.