C E

I've got the app installed in my SFDC sandbox and I am already logged in to my SFDC sandbox but when I try to connect from the Zendesk integrations page I get this error:

{"errors":[{"status":"400","code":"1301","detail":" : oauth2: cannot fetch token: 400 Bad Request\nResponse: {\"error\":\"invalid_grant\",\"error_description\":\"ip restricted\"}"}]}

Please advise if this is something on my end or not.