I am having the same issue. But only during recent development did that ‘my blogs’ link disappear. So I will now be retracing my dozens of hours of changes to try to figure out what i might have done that triggered the erroneous state.
I figured out that you have to be logged in for the invitation acceptance to work. There is no indication of that. Would be good if the login screen popped up, or a message to the effect. This sort of confusion will continue otherwise.
I need now simply to find a way to force enter the people who are not receiving the invite.