Retrieving user endpoints fail

Hi, I notice that when I try to get the endpoints it fails complaining there is no equal sign in the Authorization header. The authorization header I was giving was: Authorization:bearer Atsd/safdlhdlasf..... It works fine if it is Authorization:Bearer Atsd/safdlhdlasf..... (notice the capital B in Bearer now) Amazon returns the access token with the token type as "bearer" but does not accept it.