Is your feature request related to a problem? Please describe.
UX setting, not a problem with the OIB. Since if this isn't configured the user gets prompted to sign in on OneDrive and SharePoint Online.
Describe the solution you'd like
Following MC1150662 the setting 'Allow sites to make requests to local network endpoints' should be configured to contain the following URLs (these are tenant-specific).
https://tenant.sharepoint.com
https://tenant-my.sharepoint.com
https://tenant.sharepoint.com.mcas.ms
https://tenant-my.sharepoint.com.mcas.ms
Describe alternatives you've considered
There is none. The browser has to be configured to make the message go away.
Additional context
