If you are trying to decrypt the someone’s AxCrypt encrypted file then you needs the someone’s file password which was used for file encryption.
AxCrypt has a key sharing feature letting you add recipients by email address, who when they receive the file can open it with their own AxCrypt password.
Just sign in to the AxCrypt app with your AxCrypt account.
Then try to decrypt or open the encrypted files which was key shared with your email address.
Please note: If reset your AxCrypt account password after key sharing a file with you then you will not get access to the key shared encrypted files with the new password(which was created after password reset). You have to use the old password to decrypt the encrypted files.
Still, if you are facing any issues, please feel free to contact our support(firstname.lastname@example.org) with detailed information about the issue.
Please check out our video tutorials at https://www.youtube.com/channel/UCoSoXBjq6iCG5232fHoWStA and our other documentation at https://www.axcrypt.net/information/get-started/ to get started with AxCrypt.