Getting below error with my SFMC API call.
I'm passing ClientId, ClientSecret and API endpoint:
https://auth.exacttargetapis.com/v1/requestToken?legacy=1
Unable to determine stack using /platform/v1/endpoints: {
"message": "Authorization token invalid on URL.",
"errorcode": 40003,
"documentation": "https://developer.salesforce.com/docs/atlas.en-us.mc-apis.meta/mc-apis/error-handling.htm"