Not Authorized for OAuth in Sandbox

I’ve been implementing oauth into my application using the “code flow” method. In sandbox, I keep on getting the error

Array
(
    [message] => Not Authorized
    [type] => service.not_authorized
)

My obtainToken cURL after getting the authorization code is:

curl https://connect.squareupsandbox.com/oauth2/token \
  -X POST \
  -H 'Square-Version: 2024-04-17' \
  -H 'Content-Type: application/json' \
  -d '{
    "client_id": "sandbox-sq0idb-EskP8TWnQKx61vYAdnEOCQ",
    "client_secret": "<SANDBOX_ACCESS_TOKEN (AKA. CLIENT SECRET)>",
    "code": "sandbox-sq0cgb-yAF9ePy801ZNxWUlVdfA2A",
    "grant_type": "authorization_code"
  }'

I’ve also tested it here: https://developer.squareup.com/explorer/square/o-auth-api/obtain-token
I get the same error.

If the client_secret = the sandbox access token from the Developers Dashboard > Credentials then I an 100% sure I have them correct. I’ve looked around at other posts and couldn’t find anything that solved my issue.

Can anyone help explain why I would be getting that authorization error?

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