Assign External Users full Office 365 Licenses?

ChrisHoardMVP 

Are you sure, it's still not officially supported?

https://docs.microsoft.com/en-us/microsoft-365/admin/manage/assign-licenses-to-users?view=o365-worldwide#assign-a-license-to-a-guest-user

Assign a license to a guest user

You can invite guest users to collaborate with your organization in Azure Active directory admin center. To learn about guess users, see https://docs.microsoft.com/en-us/azure/active-directory/external-identities/what-is-b2b If you don't have any guest users, see https://docs.microsoft.com/en-us/azure/active-directory/external-identities/b2b-quickstart-add-guest-users-portal.

 Important

You must be a Global admin to do these steps.

1. Go to the https://go.microsoft.com/fwlink/p/?linkid=2067268
2. In the navigation pane, select Users.
3. On the Users | All Users (Preview) page, select Add filters.
4. In the Pick a field menu, choose User type, then select Apply.
5. In the next menu, select Guest.
6. In the list of results, select the user who needs a license.
7. Under Manage, select Licenses.
8. Select Assignments.
9. On the Update license assignments page, select the product you want to assign a license for.
10. On the right, clear the check boxes for any services you don't want the guest user to have access to.
11. Select Save.

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This sounds as it would be supported...?