I have Acrobat Pro and tried to scan a pdf with OCR which gave me a message which said something about I have to pay for the OCR feature. This led me to finding the below support doc indicating OCR is part of Acrobat Pro.

Clicking on the same exact button again it brought up the ocr tools instead of displaying the message, but I wouldn't have necessarily thought to try the same thing twice until after searching the web for which adobe product I would need to purchase to use OCR in Acrobat Pro (it's built in as it turns out)

Whatever caused this error message to show up should be addressed

doc https://helpx.adobe.com/acrobat/kb/is-ocr-or-text-recognition-available-in-acrobat-std-dc.html#