Google AdSense PIN Verification Bug
Briefly

Numerous publishers on Google AdSense are facing troubles with the PIN verification process, resulting in failed identity verifications and undelivered PINs. These issues are preventing many from receiving payments despite reaching the necessary earning thresholds. The complaints are prevalent in Google AdSense Help Forums, indicating that this may be a widespread bug. A product expert acknowledged the troubles with the PIN troubleshooter, confirming that many publishers have reported similar problems and that resolution may require waiting for replacement PINs to arrive.
A growing number of publishers and content creators are running into roadblocks with Google AdSense. They're dealing with failed identity verifications and PINs that never show up in the mail. This is leaving many stuck without payments, even after hitting earning thresholds.
The PIN troubleshooter appears to be broken. A lot of publishers have reported this problem. If you've run out of options to ask for a replacement PIN, all you can do is wait and hope that one of them eventually reaches you.
Read at Search Engine Roundtable
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