INVALID CLIENT Spotify Error

Spotify is rejecting the app credentials Songify sent. Almost always that's a typo, or the developer app wasn't saved.

1. Open the Spotify Developer Dashboard and click your app.
2. Copy the Client ID and Client Secret again. No extra space, no missing character.
3. In Songify, Settings → Spotify, paste both fields fresh.
4. Confirm the redirect URI on the Spotify app is exactly:

http://127.0.0.1:4002/auth

You have to click Add on that URI before Save. Then in Songify, the dropdown next to Link must be 127.0.0.1.

5. Click Link again.

Creating a new Spotify app is fine if the old one is a mess. Just paste the new ID and secret into Songify.

This is not the same error as Invalid redirect URI — that one is here. Don't use localhost:3050 or https:// for this; Songify's callback is http://127.0.0.1:4002/auth.