Build and Secure a FastAPI Server with Auth0

Hello! I am getting 403 errors when using access token for private endpoint, this step:

curl -X 'GET' \
--url '<http://127.0.0.1:8000/api/private>' \
--header  'Authorization: Bearer <YOUR_BEARER_TOKEN>'

Is there step by step sample for how to set up the Auth0 side such that this tutorial code will work? For example what is the Auth0 issuer vs. Auth0 domain in the .env file. Not sure if this maps to my 403 error.