probable.txt is useful for weak or reused passwords, but it will fail against strong, unique, or randomly generated credentials.
The default wordlist-probable.txt is a relatively small, generic list of common passwords. You need larger, more comprehensive dictionaries. probable
A far more frequent culprit is an invalid handshake capture. The error message may claim the password wasn't found, but the real problem is that the cracking tool can't even process the handshake properly. but it will fail against strong