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passing token_hook url through cli : export OAUTH2_TOKEN_HOOK=<http://localhost:3000/token>
but getting error when running hydra serve all :
 `I[#/oauth2/token_hook] S[#/properties/oauth2/properties/token_hook/oneOf] oneOf failed`
  `I[#/oauth2/token_hook] S[#/properties/oauth2/properties/token_hook/oneOf/0/type] expected string, but got null`
  `I[#/oauth2/token_hook] S[#/properties/oauth2/properties/token_hook/oneOf/1/$ref] doesn't validate with "#/definitions/webhook_config"`
    `I[#/oauth2/token_hook] S[#/definitions/webhook_config/type] expected object, but got null`   

it is working when passing token_hook through yaml file but not with cli

Hi. I'm sorry to bring back this thread though I've just encountered the issue after updating from `v2.2.0-rc.2` to `v.2.2.0`. Using `OAUTH2_TOKEN_HOOK` as an environment variable gets rejected by the JSON schema. I tried many formats just in case but couldn't find a way so I'm now using a configuration file.
Should I open an issue on Github about it?