We use our group structure frequently to share content with users from other organizations, and we have many groups with external members. I have just created another group to do the same thing, but this time the option to search for members outside of our org is greyed out and cannot be toggled. I checked the settings and they all appear to be the same as our other share groups, where that option is active.
Does anyone have any idea why this is happening and how to fix it? See screenshot below.