Collaborate with guests in a site

If you need to collaborate with guests across documents, data, and lists, you can use a SharePoint site. Modern SharePoint sites are connected to Office 365 Groups which can manage the site membership and provide additional collaboration tools such as a shared mailbox and calendar.

In this article, we'll walk through the Microsoft 365 configuration steps necessary to set up a SharePoint site for collaboration with guests.

https://docs.microsoft.com/en-us/Office365/Enterprise/collaborate-in-a-site

1. Azure Organizational relationships settings
2. Office 365 Groups guest settings
3. SharePoint organization level sharing settings
4. Create a site
5. SharePoint site level sharing settings
6. Invite users

Video demo, https://www.microsoft.com/en-us/videoplayer/embed/RE44Llg?autoplay=false