Using access token to query instagram API

[John Arnfield]

I'm trying to use the access token obtained by social login to query the API.

However every request to the API results in:

{
   "error": {
      "message": "Bad signature",
      "type": "OAuthException",
      "code": 190,
      "fbtrace_id": "ANsztKcnsXMhP3zIybtNMpz"
   }
}

Googling the problem tells me this is an expired token, but I seemingly get the same token for every login,
even after logging out of both my website and instagram & clearing the token record in the database.

My app is in sandbox mode.

What am I meant to do to get a token that works?