"Invalid redirect (4700)" with localhost:3000 — worked a few days ago

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1

My Zoom General App that I’ve created for test purposes suddenly returns Invalid redirect: https://localhost:3000/ (4,700) when redirecting to the authorization URL.

I was able to run the app on localhost in my browser and in the Zoom Desktop client during Friday last week, but when i tried to login earlier today I couldn’t get past the /authorize endpoint with the following error:

Invalid redirect: ``https://localhost:3000/`` (4,700)

Screenshot 2026-06-22 at 15.25.22
Screenshot 2026-06-22 at 15.25.221460×389 17.9 KB

Setup:

  • General App (in Development)
  • Redirect URL for OAuth: https://localhost:3000/
  • OAuth allow list: https://localhost:3000/

What I’ve tried:

  • Tested in incognito — same error ({“status”:false,“errorCode”:4700,“errorMessage”:“Invalid redirect url”,“result”:null})
  • Created a brand new app with identical configuration — same error
  • Signed out and logged in with the same account that owns the app — same error

Any help appreciated.

UPDATE:

After doing some more research it seems like Zoom aren’t too keen on allowing localhost as a oauth redirect url, so I tried using ngrok to forward a public adress to my local machine - which worked. But why did localhost work just a couple of days ago? Oh well.

2

I’m seeing the same issue, it was working last week and this breaks a number of our workflows. If the issue is not permitting localhost anymore, what workarounds are there aside from hosting a callback via HTTPS (which is unnecessary in our case)

There’s nothing like this in the changelogs from what I can see

3

Same experience here. I was chasing my tail trying to sort out if the issue was on my end.

4

We’re also seeing this. Users cannot authorize the app at present.

5

Any update on this?
Removing the app and reassigning didnt solve the issue.
We tested with 4 clones of the app in two different accounts and the issue is persistent.