Often when getting a Unauthorized error you can try these things first:
401 – Unauthorized
If you receive this error message it usually means that you are using your credentials for the wrong plugin. It could also mean that the username and/or password is incorrect, try copying & pasting instead of typing in directly and double check for whitespace. If you need support, you should email your regions Klarna Merchant contact.
Link to our documentation regarding error codes:
https://docs.krokedil.com/article/267-klarna-checkout-error-codes
If this does not help you, you need to contact Klarnas merchant support as this is an account related issue. We as a third party developer has no access to this info so Klarna is the only ones that can help you in this case,
