Howdy - if you are receiving the below error message when opening ANY Box files, note that it is in regards to this error: https://admin.microsoft.com/#/servicehealth/:/alerts/SP843810 (accessible via the Office365 Admin Console)
The full details as of today:
Issue ID: SP843810
Affected services: SharePoint Online
Status: Service degradation
Issue type: Advisory
Start time: 31 Jul 2024, 09:41 BST
User impact
Users may incorrectly receive a security warning prompt when opening Excel files in SharePoint Online.
More info
More specifically, users may incorrectly receive a security prompt when opening Excel files in the Excel app within SharePoint Online. Also, affected users may see the following message “This content presents a potential issue”.
Scope of impact
Impact is specific to some users, who are served through the affected infrastructure, attempting to open Excel files in the SharePoint Online Excel app.
Current status
31 Jul 2024, 12:24 BST
After reviewing the service telemetry, we’ve determined that the security warning prompt is the result of a necessary short-term fix for a separate issue that was recently implemented. We’re creating a long-term fix for this separate issue that’ll remove the need for this false security warning prompt, remediating impact. We expect that it will complete development and deploy on Tuesday, August 13, 2024. To suppress the warning for trusted sites, tenants can add the trusted sites and hostnames in the internet zones feature.
Microsoft, staying on brand, has not released a new update since. Even though they say it only relates to Excel, it is all Office files.