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I personally know ( as in, have met them and seen their adsense accounts ) 3 people who have adsense accounts applied for , approved and opened for over 2 years ( in one case 4 years ) that they have never used ..never put the code on a website....
Account Disabled = it is a more serious matter in which your site(s) may be in violation of fraudulent clicks or invalid activity. Youre the only one who can answer that.
Funny, I thought Google was the only one who knew for certain the specific reason they banned an account.
jbayabas - Number one is the most common -- 90% of the time. I'm sure the OP did not receive an email because he was already directed to Invalid Activity support page when logging in.
Netmeg, the problem is I do not have an email from Google Adsense, so I do not have an "Issue ID#", which is a required field on the page you suggested. Also I have not made any changes, as I don't know what is wrong.
YOur violation is serious enough that it does not require an email or Issue ID. Google had already provided you a link to the reason: "AdSense account may be disabled for policy reasons".
For Copyright violation, you will receive an email to give you a chance to file a counter claim. Except for multiple violations, no email is required.
For Adult content violation, you will also receive an email so you have a chance to take down the offending images. But this is not serious enough to have your account disabled.
For Invalid Activity violation, Google is not very forgiving. If your account demonstrates deceptive behavior then it will be disabled instantaneously. No email is required. This, I believe 110%, is what happened to your account.
MFA is kind of a dumb term; in a sense all of us monetizing with AdSense are MFA, and just because a site was created with AdSense in mind doesn't mean it doesn't provide value.
But the true MFA, where some bottom feeder plotzes a bunch of RSS feeds, or scrapes or spins other people's content in order to make a few pennies off long tail search terms - that's more problematic.