Adobe Sign REST API error with hostname na2.documents.adobe.com

Has anyone encountered this error?

java.io.IOException: HTTPS hostname wrong: should be <api.na2.documents.adobe.com>, but cert says <CN=secure.echosign.com, O=Adobe Inc., L=San Jose, ST=California, C=US>

API request: https://api.na2.documents.adobe.com/api/rest/v6/transientDocuments

Any advice is appreciated