I have had the same problems with the signing on with Steem Engine as well as a few other dapps. You're not doing anything wrong. I am thinking it's the blockchain trying to figure it out. I do hope, with that being said, Steem works on this issue as time goes on, because it can be overwhelming for new people who are learning what the keys are all about. A work in progress, I guess lol.
I saw you hustling that 2fa like a pro last night lolol. It sounds crazy but it is probably easier than it sounds. Here's wishing you luck! fingers crossed
And thank you for the shout out! I will be waiting for that elephant he he. They are right up there with the Unicorns ;) Great video!! :)