With implicit auth the access token is returned in the hash from the URL.
If you can’t obtain the hash from the URL, then don’t use implicit auth.
Implicit Auth is sorta designed for Client Apps that you give the whole code to the user. In order to protect/not leak your secret. As oAuth Authorization Code Flows need the secret.
Implicit Auth’s also cannot be renewed, so every four hours or so, your access code will die forcing you to make the user authorize again.
You probably want to be looking at the oAuth Authorization Code flow for most use cases.