Found access to one of my old wallet with btc in it but unable to login.

[elgringo0]

So today I did some digging, I found a file in a dropbox that I had encrypted. It had a wallet id of blockchain.info and a password. I know I have some btc on a wallet that I lost access to many years ago. It also contained a 20 word mnemonic.. I tried to recover from blockchain.com(was blockchain.info before) but the word's don't work and the mnemonic is too long. The password worked, but then I was prompted asking for a second password which I do not remember. I have used every password I could think of I have used since 2012-2013. Any idea on what I could do? Also what kind of wallet uses a 20 word mnemonic code?

Apologies if this is the wrong subsection for posting this. Any replies are greatly appreciated!

[nc50lc]

Without the second password, you will not be able to decrypt your wallet.
You'll need your "wallet.aes.json" file to bruteforce it using BTCRecover; but AFAIK, the tools that can extract that from their server now can't since it's designed for the old version.
(like "download-blockchain-wallet.py" from old BTCRecover)

Try their support. (Good Luck)

Any idea on what I could do? Also what kind of wallet uses a 20 word mnemonic code?

Since it came from the same backup, that must be your old Recovery Phrase that is not BIP39 compatible.
The page where you restored it may be for their 12-word BIP39-compatible Recovery phrase: https://login.blockchain.com/beta/auth/recovery?import
Where it should be restore to their legacy recovery phrase page: https://login.blockchain.com/beta/legacy-pages/forgot-password.html (which isn't working last time I tried)

However, even if the mnemonic works, it will just show you your password and wallet ID that you already has.