I cannot invite as a Guest someone with an email address from the same domain as mine

Maciej Rydlewicz
Hello.
I have a paid account and 4 commercial users. We have a few people in the organization that we would like to invite as a Guest for now. When I fill out an invitation and enter an address from the same domain as my (Admin), the Guest option is grayed out and unavailable. Why can this be so?
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