I've registered a new OAuth integration record on my dev instance of Airtable, however when trying to perform the first step of authorization by getting a code I am presented with the following error:

"This third-party app failed to properly construct a request to Airtable: invalid client_id or mismatched redirect_uri"

This is the URL I am using:

https://airtable.com/oauth2/v1/authorize?client_id=1236efdd-af9c-492f-8885-4e5e08fa7890&redirect_uri=https://devtest.planr.io/ords/f?p=800%3A2723&response_type=code&state=436287f7af5f17f557e268439c72b382dce853220653118aec882823&code_challenge=d3N-LaD1qJ-l65YaZiCINK6cAm30GR7_cNX5VckyzhU&code_challenge_method=S256&scope=data.records:read%20data.recordComments:read%20schema.bases:read

What am I doing wrong?