Where could I get the access and refresh tokens from?

I’m having a bit of trouble getting this to work with my Magic Mirror. The display is there but it has 0 in all of the categories. I have followed the steps and I get up to running setupAccess.py which takes me to a webpage where I allow access to all of the checkboxes, but it then just redirects to the magic mirror screen with 0s in all of the categories. if I run getData.py it says

{"message": "credentials.ini exists", "type": "status"}
{"message": "Reading from credentials.ini", "type": "status"}
{"message": "Read of credentials.ini successful.", "type": "status"}
{"message": "credentials.ini exists", "type": "status"}
{"message": "Reading from credentials.ini", "type": "status"}
{"message": "Read of credentials.ini successful.", "type": "status"}
{"message": "tokens.ini exists", "type": "status"}
{"message": "Reading from tokens.ini", "type": "status"}
{"message": "Read of tokens.ini successful.", "type": "status"}
{"message": "Making API call", "type": "status"}
{"message": {"401": {"errors": [{"message": "Access token invalid: <your access token>. Visit https://dev.fitbit.com/docs/oauth2 for more information on the Fitbit Web API authorization process.", "errorType": "invalid_token"}], "success": false}}, "type": "error"}
{"message": "Invalid token, reauthorise fitbit API", "type": "status"}

and the tokens.ini file says:

[Tokens]
acc_tok = <your access token>
ref_tok = <your refresh token>