Azure B2B show guest user SPO and onedrive people picker

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i want to add "guest user" from other tenant to our tenant.

it is a kind of federation between 2 firms. 

So the users should find users from other firm with an easy way to share documents and sharepoint sites/libraries. 



I also want to see this users in the "people picker" for sharing SPO websites and also Onedrive sharing (also desktop client).

i have used: "Set-SPOTenant -ShowPeoplePickerSuggestionsForGuestUsers $True".


But: my guest users are not visible in people picker when i try to share website and also not available on onedrive sync client.


Do i need to run Set-SPOSite -ShowPeoplePickerSuggestionsForGuestUsers $True for every existing site?

How about onedrive? do i need to enable the Guest suggestions also with command?


Thank you





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Did anyone have thoughts on this?