OneDrive - Share with external users only for members of a group

Hi,

We are trying to configure external sharing for OneDrive only for the members of a group, but we can't do it.

This is our initial configuration (sorry, it's in spanish language):

Only share with organization users.

We read this documentation:

https://docs.microsoft.com/en-us/onedrive/manage-sharing

If we select the penultimate option (Limit external sharing to specific security groups), we select this options:

Accept.

If we go to the OneDrive for a InfraOneDrive member, we can't share with external users.

How can we enable external sharing only for the members of a group?

We only do it enabling external sharing for all our organization and then modifying users manually and disabling them external sharing. But we think it's not an option.

Thanks!

Miguel