The salt is not the seed itself. While the BIP seems to indicate that the whole mnemonic is used as a salt again, that is not the case. The salt is only "mnemonic".
Try using this:
https://stuff.birkenstab.de/pbkdf2/.
Message (password):
conduct coral enrich local script mountain remain fringe latin throw wood web
Salt:
mnemonic
Iterations:
1
Key length (dklen):
64
Generate Hash
Result (hex):
001f53a43e04c1dd4980bc65ea6f68c33124a671ce9d407b1c5c52adcbfddef3f51784f824af6c6f8cd7beb2cdad02b39638e3c77dd0fd48865573fcb73cf0df