Encrypt Password not working

[gonza1207]

I'm authenticating with my demo account. If I choose to not encrypt password, the login works and can use the API. If I just change the value of encrypt password to True, then I get authentication error.
I have tried using the API Companion from IG on web, and Im able to authenticate encrypting the password and the same credentials.

Everything indicates that the password encryption using the encryption key is wrong, but I don't understand how anyone else doesn't have this problem.

ig_service = IGService(config.username, config.password, config.api_key, acc_number=config.acc_number)
ig = ig_service.create_session(version='3', encryption=False)

That works.

ig_service = IGService(config.username, config.password, config.api_key, acc_number=config.acc_number)
ig = ig_service.create_session(version='3', encryption=True)

That fails with:

{"errorCode":"error.security.invalid-details"}