While running OAuth Process, make sure to follow below points:
1. Correct Client ID and Redirect URI is specified.
2. Scopes provided in Authorization URL should match exactly with the scopes provided in Adobe Sign application.
3. Use the correct shard (na1, na2, au1, eu1, jp1) as per the account is being configured.
4. Remove any spaces provided in the authorization URL (if any).
5. Check the Syntax of Authorization URL: