That explains a lot, it means that your backup phrase is indeed from blockchain.info because it successfully return with an account and password.
But what do you mean by "login still missing"?
Did the recovery page displayed only the "5-letters" and password not the "WalletID" (long string of characters)?
Perhaps it's an "alias" used in the old versions. In that case, you need to contact their support to get the corresponding WalletID for that alias to be able to login.
They might ask you for some verifications (not KYC, but dates/email addresses, etc.) for them to respond with the walletID.
If you have the walletID, the reason that the login credentials aren't working may be because you've changed your password before and your backup was outdated,
the backup phrase for legacy blockchain accounts should be replaced when changing account password since it's your login's backup.
But what do you mean by "login still missing"?
Did the recovery page displayed only the "5-letters" and password not the "WalletID" (long string of characters)?
Perhaps it's an "alias" used in the old versions. In that case, you need to contact their support to get the corresponding WalletID for that alias to be able to login.
They might ask you for some verifications (not KYC, but dates/email addresses, etc.) for them to respond with the walletID.
If you have the walletID, the reason that the login credentials aren't working may be because you've changed your password before and your backup was outdated,
the backup phrase for legacy blockchain accounts should be replaced when changing account password since it's your login's backup.
I wanted to say that typing the seed phrase it showed the password (the one I had).
But it didn't show me the Wallet ID or any other information of the account, so I guess the only help I can get to follow on is from their support desk. I sent them an e-mail let's see what they say...
Have you already checked all your mom's emails that she could've used when registering on blockchain? You can search in your gmail account (assuming it was a gmail address) for the file extension mentioned by o_e_l_e_o by using:
Nothing found.... Code:
filename:wallet.aes.json