thank you, exactly what i was looking for
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I had the same problem. And it 'automatically' disappeared...
(In my case, I had not yet responded to their verification mail, and retried logging in too many times before realizing...)
Did you try doing what the message said to do?
Unbelievably last.fm has also applied rate limiting to the first authentication api call.
I am afraid that means you will just have to keep trying until it works