Why can't I add new users to an existing group?

I have a group (with 56 current members) and I find that I can't any any new users (external to my organisation) as the error is "not part of your account".

Of the current membership, I have nine external organisations currently, and was a major decision to go with Smartsheets as a managemnt platform.

Am I missing something here, or has this recently changed?

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