API Error 6103

Hello,
I am trying to use the API and I am running into an issue that I am getting the error ‘code’: 6103, ‘message’: ‘Invalid format for X-Auth-Key header’.
The API token is fine because I am able to test it and it passes.

I have tried using curl or python but I always get the same response. Has anyone run into this issue before and how have you fixed it.\

Edit:
It works with my global API key but it does not work if I create an API token with DNS edit for the zone

Shouldnt the API token be passed via Authorization instead of X-Auth-Key?

You would be correct.