Office 365 Extranet Users - Minor Gotcha

Today I was adding external users to a site collection for a customer and ran into a learning experience. To enable "external sharing" the site collection feature needs to be enabled and "Manage External Users" need to be enabled on "Manage Site Collections" on the site admin portal.


The issue I ran into was related to was related to enabling "Manage External Users" which is enabled under site collection settings. The "settings" is grayed out unless you deselect all site collections - not the most intuitive as you would presume it is related to individual site collections and not all at once.


Greyed Out:

Not Greyed Out: