I only got one email, with the subject "Verification E-Mail", from cnfrmpro at microsoft.com. I clicked the link inside it only once a few hours ago, and it worked back then (sending me to the https betaexperience address, which hasn't worked until moments ago).
Just make sure you are logged in the .NET Passport account you used when registering and try opening that site until it stops giving you the "try later" error.
It even showed a "Download" and "Install Instructions" buttons alongside the key.
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