to avoid
> class org.scribe.exceptions.OAuthExceptionCannot extract an acces token. Response was: {"error": "invalid_grant", "error_description": "Cannot use client_credentials with a consumer marked as \"public\". Calls for auto generated consumers should use urn:bitbucket:oauth2:jwt instead."}
 
you must check this box when setting up the Oauth consumer in Bitbucket cloud:
 
This is a private consumer
Enables the client_credentials grant type. Installable applications that ship their OAuth consumer credentials as part of the application should not be marked as private.