Trying to invite myself as a client
I tried to invite myself as a client using my 3 letter account. I received the invitation email and the confirmation email after I accepted. The client account is listed as Access Requested. I am unable to get beyond that point.

We’re investigating this. Did you click the button in the orange confirmation email?
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Keith Edelberg commented
I was finally able to invite myself and grant myself access. Since my GoDaddy Pro and GoDaddy 3 letter email accounts are the same, when I received the invitation email, I right-clicked the button in the email to open in a private window. Next, when I received the confirmation email, I right-clicked and opened that in another private window.