Brower requests to the token endpoint must be part of at least one whitelisted redirect_uri

I’m getting an unexpected 400 error when requesting a token using the authorization code flow with PKCE:

Browser requests to the token endpoint must be part of at least one whitelisted redirect_uri.

Note that this error is distinct from the common 400 regarding absolute URI whitelisted in client app settings.

Here is the login URL:


Here is the POST request:

curl 'https://REDACTED/v1/token'
  -H 'authority: REDACTED'
  -H 'accept: application/json'
  -H 'sec-fetch-dest: empty'
  -H 'user-agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_3) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/80.0.3987.149 Safari/537.36'
  -H 'content-type: application/x-www-form-urlencoded'
  -H 'origin: null'
  -H 'sec-fetch-site: cross-site'
  -H 'sec-fetch-mode: cors'
  -H 'referer: http://localhost:3000/?code=REDACTED&state=REDACTED'
  -H 'accept-language: en-US,en;q=0.9'
  --data 'code_verifier=REDACTED&grant_type=authorization_code&redirect_uri=http%3A%2F%2Flocalhost%3A3000&client_id=REDACTED&code=REDACTED'

Here is the client:

    "client_id": "REDACTED",
    "client_id_issued_at": 1584723536,
    "client_name": "REDACTED",
    "client_uri": null,
    "logo_uri": null,
    "redirect_uris": [
    "response_types": [
    "grant_types": [
    "token_endpoint_auth_method": "none",
    "application_type": "browser"

The redirect URI appears to be whitelisted for the client, so I’m not totally sure what’s causing this error message. I haven’t seen mention of this particular message anywhere in the forum or Okta documentation, and I’ve successfully implemented other PKCE clients using localhost before so I’m not sure what’s different in this case. Any ideas here? Thanks.

Hi @djfdev

Can you please open a support ticket with us through an email to in order to further check the back-end logs for further details regarding this error? Please mention in the email the client ID used.

@djfdev were you able to find any resolution for this error?