veracrypt has these hash modes (-m):
Therefore, your use of -m 6221 is completely wrong.
Code:
137XY | VeraCrypt | Full-Disk Encryption (FDE)
X | 1 = PBKDF2-HMAC-RIPEMD160 | Full-Disk Encryption (FDE)
X | 2 = PBKDF2-HMAC-SHA512 | Full-Disk Encryption (FDE)
X | 3 = PBKDF2-HMAC-Whirlpool | Full-Disk Encryption (FDE)
X | 4 = PBKDF2-HMAC-RIPEMD160 + boot-mode | Full-Disk Encryption (FDE)
X | 5 = PBKDF2-HMAC-SHA256 | Full-Disk Encryption (FDE)
X | 6 = PBKDF2-HMAC-SHA256 + boot-mode | Full-Disk Encryption (FDE)
Y | 1 = XTS 512 bit pure AES | Full-Disk Encryption (FDE)
Y | 1 = XTS 512 bit pure Serpent | Full-Disk Encryption (FDE)
Y | 1 = XTS 512 bit pure Twofish | Full-Disk Encryption (FDE)
Y | 2 = XTS 1024 bit pure AES | Full-Disk Encryption (FDE)
Y | 2 = XTS 1024 bit pure Serpent | Full-Disk Encryption (FDE)
Y | 2 = XTS 1024 bit pure Twofish | Full-Disk Encryption (FDE)
Y | 2 = XTS 1024 bit cascaded AES-Twofish | Full-Disk Encryption (FDE)
Y | 2 = XTS 1024 bit cascaded Serpent-AES | Full-Disk Encryption (FDE)
Y | 2 = XTS 1024 bit cascaded Twofish-Serpent | Full-Disk Encryption (FDE)
Y | 3 = XTS 1536 bit all | Full-Disk Encryption (FDE)
Therefore, your use of -m 6221 is completely wrong.