HI @HelloMusicFamily
Please, take a look into our Docs here where you will find valuable information on how to use OAuth with Zoom
https://marketplace.zoom.us/docs/guides/auth/oauth/#step-2-request-access-token
It looks like you are creating the token with client credentials that are tied to Oauth applications.
Are you trying to use a Server-to-Server Oauth app? In that case, you want to use account_credentials
Hope this helps,
Elisa