Im a pilot and a senior backend engineer so this would be pretty interesting. I tried applying, but the post request to https://flightaware.com/about/careers/position/61.327/apply is giving me Error 401: Bearer authorization missing, despite clearly having the Authorization: Bearer {token} header.
Can you confirm that it works?
FWIW I just tried it and it worked for me. Perhaps you can check the base64 value you generated for the token? Sometimes error messages can be misleading...