Migrated worklight 6.1 project to Mobile First 7.1
Using IBM MobileFirst Platform Studio 7.1.0.00-20160801-2314
Build app to work remote Mobile First server by g
Here are two questions with the same errors as you, perhaps the solutions provided there will be of help:
Additionally, have you made sure to configure your application server with TLS 1.2 support, as well as set the application plist with ATS support?
See here: https://mobilefirstplatform.ibmcloud.com/blog/2015/09/09/mobilefirst-platform-support-for-ios-9/