Sha512 encryption not working in a converted NodeJS project - error 401

I am converting a project from .NET to NodeJS. I had setup sha512 password encryption in the .NET project with a salt value.

However, this is not working correctly in the converted NodeJS project. I have checked all settings for the Security Provider (Use Password Hash Verify - Unchecked), Password encryption and salt value in the NodeJS project, but the Security Login step keeps returning Unauthorised 401 error.

I have compared the generated sha512 hash values in an online generator form and the encrypted hash values match with the the DB values.

Any help in debugging and resolving this issue would be greatly appreciated.