Whiteboard with external participants

I just tested it and whiteboard sharing with external user is kind of working now.

https://www.microsoft.com/en-us/microsoft-365/roadmap?filters=In%20development%2CRolling%20out&searchterms=66759
shows: GA April 2022.

There are some hops need to go through, whiteboard data need to opt-in to Onedrive for business.
Set-SPOTenant -IsWBFluidEnabled $true

But there is a big blocker :
OneDriveLoopSharingCapability need to be set as ExternalUserAndGuestSharing :
Set-SPOTenant -OneDriveLoopSharingCapability ExternalUserAndGuestSharing

I found the only way I can change OneDriveLoopSharingCapability is change SharingCapability
to ExternalUserAndGuestSharing :

Set-SPOTenant -SharingCapability ExternalUserAndGuestSharing

But this will change Sharepoint 's global External sharing policy to "Anyone", which is a big security concern.

Check 
https://docs.microsoft.com/en-us/powershell/module/sharepoint-online/set-spotenant?view=sharepoint-ps


Would love to know if there is way to enable OneDriveLoopSharingCapability without changing Sharepoint "External Sharing" to anyone.