Can’t connect to our service, please check your network connection and try again. error code: 104103
SDK version- v5.2.42043.1112
Tried to update the SDK to latest version but there were few methods depricated : ZoomSDK.getInstance().loginWithZoom(username, password), ZoomSDK.getInstance().getPreMeetingService().scheduleMeeting(meetingItem)
Can you instead try updating to v5.5.1 and see if that makes any difference? This is the latest version which does not contain the changes you are referring to.
I would also strongly recommend updating to a new version when you are able. The login method and meeting scheduling methods you are referring to are no longer supported, so migrating to OAuth for user authentication will be required. Information on how to get started with this migration can be found here.