Add security group as member in M365 admin

[kjetilkulterud]

I am quite sure I was able to add security group as member in a group in the 365 admin earlier, but now I cannot do this. 

Is this a "new feature" from Microsoft?

[#2]

It's a "preview": https://docs.microsoft.com/en-us/azure/active-directory/roles/groups-concept
The experience can change at any time, until they release it in GA status.

[#3]

So it was/is a "preview" to be able to add a security group as member of another security group in the 365 admin center? I am able to do it in Azure AD, but not in the 365 admin center.

[#4]

The feature itself (adding group to admin role) is in preview, and until that's finalized, the experience across different endpoints will vary.

[#5]

So adding a group to admin role is the same as adding a security group as a member of another security group?