Hi @blase.sacus
Thanks for reaching out to the Zoom Developer Forum.
Could you please confirm what app type are you using?
If you have set up a Server-to-Server Oauth app, the error might be on the way that you are requesting your access token.
Instead of using “client_credentials” in grant_type, you will have to switch it to “account_credentials”.
Here is a helpful post on How to User Server to Server OAuth app with Postman that might help you to troubleshoot where the error could be:
Let me know if this helps,
Elisa