March 2017 - last edited March 2017
I did the exact same thing, and am also encountering the error. I never got an email to see her in the Museum, but ended up visiting her there. Since then, I have not received any emails from her. My current mission is still Peebee: Secret Project, and it says ON HOLD: Wait for Peebee to learn more about Remnant Technologies.
(Edit - This is on PC)
Also having this problem with PeeBee (PC version).
I also had a failed email warning for Vectra, but had no problems carrying out her loyalty mission (on IMO the coolest asteroid world/moonscape ever in a video game).
So if I'm to understand it right, it seems the game wants me to return to the Tempest much more often than I have been in order to access important emails at specific junctures in what seems like a very thin and vanishing window of time, or else I don't get them at all - never mind getting them too late; rather I just don't get them as if they were never sent. Hmm..don't like.
That it even has a [failed email] warning in the journal entry indicates that this may be intentional, but that's just an awful way to do it. To Bioware: Please consider changing or fixing this. I'm sure there are many, many players who are trying to do as much exploring and minor questing as possible on any given planet in between visits to the Tempest and/or returns to the Nexus, which sometimes means long hours spent away from the ship and long hours between emails.
Came back to the game and finally found how to fix it....... Get to the point in the game hunting the archon and after you talk to gil about the transponder you get the email museum doesn't matter
Oh nice thank you CrownClown94. That worked for me. I gave up on playing/trying exactly before talking to Gil. Unlucky timing I guess but hey it worked and I got the quest now.
For those with the same problem that I had and who want to know when exactly that scene happens (careful spoilers!):
After you are done with convincing the people on Aya (either through Havarl or Voeld) about your good intentions and after you went to their vault, you get a new priority mission called "Hunting the Archon". You are going to have to travel to Kadara and speak with a few people (just follow the priority quest) until you find out about the transponder on Kadara. As soon as you get the transponder you have to talk to Gil on the Tempest. The moment you're done with that conversation I got the email for Remnant Scanner and I'm now able to trigger the mission!
Thanks again to CrownClown!