That feature has not worked in over 3 years. It was part of the support (which included auto-tagging) provided by Gracenote. The relationship with Gracenote was discontinued when AOL sold Winamp to Radionomy.
Even when this feature was a part of Winamp, many people reported having problems getting it to work correctly.
Winamp Pro 5.666.3516 fully-patched - Komodo X Touchscreen by Victhor skin
Windows 10 Home 64-bit desktop - Logitech Z906 5.1 speaker system