SharePoint Online - Share with other domain without invitations

[jscroggin]

Can someone tell me if this is possible in SharePoint Online?

We'd like to be able to authorize other o365 domains we're federated with without having to authorize individuals. I know I can limit external sharing by domain, but is there any sort of Everyone permission that includes these external users?

[#2]

@jscroggin 

Hi, it is posible to set the Sharing permissions to Anyone. But I would not recommend that.
Manage sharing settings - SharePoint in Microsoft 365 | Microsoft Docs

If you do please add some additional security messurs.

A more suiteble solutions for multitenant acces is the B2B feature for Connected Organisations in Azure.

Please read this article: Create a B2B extranet with managed guests | Microsoft Docs