Setting up channel as ad placement

I log into my Adsense account, then create a new channel and "tick" "Show this channel to advertisers as an ad placement" option.

Then I go to "Manage ads". I choose the ad unit which only appears on my homepage and put my brand new channel as the only one on "Your selected channels" section.

Then I wait for some time (a few hours). Then I log into my ADWORDS account and try to start a new campaign just to check if I can select that placement I had created for my "publisher" website. Although I see many sites with placement options available, I can't see mine.

What am I doing wrong? Or does it take a lot of time for the adwords system to catch up with my changes from the publisher side?

Thank you in advance.

I think either you must wait for the placement to be approved by an Adsense person, or there may be traffic minimum

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