Roughly when apps expires in 45 days, we will receive email reminding us some of are apps are expiring.
Here is what we find:
1) Some of our apps are expiring: click an individual app=>Signing, shows expiration date: 2016-9-24
2) Our signing credentials are expiring: click Settings=>Signing Credentials, shows 3 signing credentials expires on 2016-9-24
3) Login to developer.apple.com, it shows our iOS Provisioning Profiles are expiring on 2016-9-24.
4) We need to Edit those expiring provisioning profile, then use the newly updated profile to recreate sining credentials on apperian, then resign the apps with the new signing credentials.