Don't panic.
The 23 words are not yours.
Copy paste from Reddit: https://www.reddit.com/r/crypto/comments/684zvj/need_help_generating_lastword_checksum_for_bip39/
Pastebin here: https://pastebin.com/49geYmdr
BIP39 seed backup phrase with the missing last word... HMMM... $300 crypto money on the line - extracting Bitcoin forks
Don't panic.
The 23 words are not yours.
Copy paste from Reddit: https://www.reddit.com/r/crypto/comments/684zvj/need_help_generating_lastword_checksum_for_bip39/
Pastebin here: https://pastebin.com/49geYmdr