In 2017, I created one account to explore GitHub. I created few publc repos and a few private repos. I am finally begining to use GitHub in earnest, stating with the private ones. I have invited some collaborators and they accepted it. I wanted to use a different email I have. The idea is to begin use it more as a main private repo contributor. I sent the invite. I got the email, followed the email instructions and was getting 404. There was indication saying a 404 means to login. But the email has no GitHub account. Believing the invitee needs an account, I preceded to create a GitHub account. I repeated the attempt to accept the invite and I still get the 404. It appears GitHub is lost between my two emails addresses. How do I resolve this? The first email account was more of “playaround” “Learn Github” account for the last 3 years. Now that begining to use it more, the goal was to have an offical company email address to be a main contributor, probably in the long run, take ownership of the repositories. But for now, I just wanted ot invite the emailaddress to be a collorator, fist. Does a collabotor require an GitHub Account?
I was able to successfull invite the email address by first removing the initial invitation created when the email account did not have a GitHub account. Once I created one I had to delete the invitaton and invite the UserID and this time received email allowed for a successful invitation.