I figured out the solution to Blog Invitation Error!!!!!
Added 2018-12-18 13:19:18 +0000 UTCVideo tutorial: https://www.youtube.com/watch?v=JIYvhgH4WYk

The cause is that Blogger accidentally sent you 2 Invitation emails at a same time. And it turned out that the 1st email is false & the 2nd email is the true Invitation.
I tried creating a new Gmail and tested. This was what I've got when I invited myself: 2 invitation emails.
- Click the 1st one, it will show "Blog invitation error".
- Click the 2nd one (the one hidden in "...") and you will be able to accept ^^ --> The one hidden in "..." is the true invitation.
So, please choose the latest invitation email (the one hidden in "..."), click to expand the "..." then click Accept invitation ^^
Outcome proof:
