OAuth 403 error in Development environment for General App

API Endpoint(s) and/or Zoom API Event(s)
(Error - Zoom)

Description

I am building my first Zoom app, and it’s within the Zoom client. It’s written in VUE JS, and I selected “General App” when creating it within the Zoom Marketplace.

I am simply trying to redirect to the Oauth approval screen for the user, but keep getting a 403 error in the Dev Console saying the domain and/or scheme is not allowed.

Sending to this link (vars have been changed)
https://zoom.us/oauth/authorize?response_type=code&client_id=123456&redirect_uri=https://xyz.com

I have my URL (https://xyz.com) setup as the Oauth redirect value in my Marketplace listing.

It works fine OUTSIDE of the Zoom client as a test, but not within the Zoom client.

Any help would be MUCH appreciated. Thank you!

Error?
In the Dev console -
VM26:1 zoom 403 Forbidden, domain or scheme is not allowed:
https://zoom.us/oauth/authorize?response_type=code&client_id=123456&redirect_uri=https%3A%2F%2Fxyz.com

How To Reproduce
Steps to reproduce the behavior:
*1. Request URL / Headers

HTTP/1.1 200 OK
Content-Type: text/html
Content-Length: 336
Connection: keep-alive
Date: Sat, 26 Apr 2025 03:16:58 GMT
Server: AmazonS3
Accept-Ranges: bytes
ETag: “4a87a73e7d2331af889bf60f2279b244”
Last-Modified: Fri, 25 Apr 2025 21:40:49 GMT
Cache-Control: public, max-age=0, s-maxage=31536000
strict-transport-security: max-age=31536000; includeSubDomains
x-content-type-options: nosniff
content-security-policy: script-src ‘self’ https: ‘unsafe-inline’ https://source.zoom.us https://appssdk.zoom.us https://zoom.us https://xyz.com
referrer-policy: origin
X-Cache: Miss from cloudfront
Via: 1.1 43fdc10c34c2e19fe9ecc909cc348782.cloudfront.net (CloudFront)
X-Amz-Cf-Pop: ORD56-P3
Alt-Svc: h3=“:443”; ma=86400
X-Amz-Cf-Id: -HIpWKBo9USjiLKSj9AjMNvWmbGix7vrdS8AduZWhy7AdMAi6holQg==

2. Authentication method or app type
Redirect to URL using “window.location.href” command on button click event.

If anyone has any ideas, you will be my BFF for life.