Just opt-in Windows Insider fast ring but it is not finding updates?

I just enable Insider Preview Build under Windows Update > Advanced options > Get Insider Preview, then I moved the slider to the Fast level. After that I restarted my computer. I also have Developer mode activated and my Windows is in en-US.

But it doesn't seem to be installing anything related to insider builds.

My registry looks like this:

I tried ruing

%windir%system32wuauclt.exe /detectnow

But nothing happened.

What else do I have to do to get the updates?