Workday Accounts Test Connection Fails

I am getting an error when trying to do a Test Connection from ISC to a Workday Accounts source.

We have detected an error from the managed system.

Error Received:

Exception occurred while generating access token: Unable to generate access token. Response returned: {“error”: “invalid_grant”}

We have this same connection working with no issues in IIQ. We are now moving the connection to ISC with the same parameters, etc. and we are getting this error.

Per the docs, I believe we have it set up correctly.

Any insight would be appreciated.

have you tried verifying if the same creds works via postman?

We are NOT using the SaaS connector.

Also, this is working with the same creds in IIQ, so I know that the creds are working.