Azure B2B and automating setting up guest accounts between two O365 tenants.

Howdy!

We are now in a multi-tenant O365 environment and sharing SPO between environments has become cumbersome. So we are looking at automating importing Tenant B’s users as guests in to Tenant A without an invitation being sent out.

I know we can use PowerShell and a CSV file to create the Azure AD B2B guest accounts, but in order to keep up with on boarding and off boarding of users in the Tenant B we’d need to do this at least daily.

Is there another way to do this? Perhaps automatically federating accounts from Tenant B in to Tenant A as guest accounts without a PowerShell and CSV route?

Thanks!