I am trying to send invitations to the site.
The invitations are not being sent/received by non-Microsoft email users.
If I send an invitation to my onmicrosoft email account, I do receive the invitation.
However, when I try to send to a Yahoo or Gmail account the invitees never get the email.
What am I missing?
Example Contact, with email -
Invitation -
Invitation Activities and Notes View for above contact -