I've been trying to build a local app that can access the API, so I can build specific email reports. I'm able to get an authorization code, but once I make a POST request to the Access Token endpoint, I get '{"error":"invalid_grant","error_description":"PKCE verification failed."}'
I have double-checked that the verification code and its hash "match". I'm using Axios for HTTP calls.
Could this be a CORS issue?
