I am getting error message:
"either this email address is invalid or already registered"
All users are allowed to have a personal network, outside of their connected network. That's why the system asks you to create a network before proceeding with accepting any invitations.
At the moment, I do not see any network invitations for your account. Can you please kindly ask your network administrator to resend your invitation? I want to ensure it's not being blocked by any servers.
With regard to searching for outside networks, for the security and privacy of all networks, we do not allow network searching at all.