If Google Adsense does not recognize your login, you don’t need to panic.
As a webmaster seeking to monetize online earnings, dreaded mail from Google is always the last thing one would like to hear in the world. Under these circumstances, if while logging in Adsense account you get to see a message that this is not a valid login (though for banned accounts, different message comes) one is surely to miss a heartbeat.
Google has clarified the matter about such messages coming while logging in and sought to clarify the confusion among publishers about this login error message, when you are sure about the email address you are using.
As per the clarification issued by Google, if you're seeing this error message, this means your Adsense account shares the same login and password as a Google Account, but the two accounts are not linked.
If so, Google system would allow access only to your Google Account and not your AdSense account. To avoid such circumstances, Google advises you to maintain two separate passwords. This would ensure that you're logged out of Google Accounts for any other products you use, such as Gmail or AdWords.
As Google says, it understands this inconvenience and the confusion it causes and is working on migrating all AdSense accounts over to Google Accounts.
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