Yes, I too have registered for the Oreo beta update.
12+ hours later and still waiting, not sure what the hold up is but was probably expecting too much from hmd/Nokia, as usual.
I have installed the January security update but will have to keep waiting, no choice really.
Jumped through all the hoops to get the beta and nothing.
Miffy, you bet! ;-((
Make a backup of Google. Then reset the factory settings.
But why does my Nokia 6 work perfectly? No mistakes at all.