Mine just showed up in
MDE. It took about 3 hours. If you got a confirmation email, it should show up sometime soon.
I talked to tech support and they said reservations not showing up in MDE right away was a "known issue" for a few weeks now, but if you have a confirmation email, then you have a reservation. Hopefully, everyone's will show up soon and the system will be working so others can make reservations as well!