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This error happens, when the connection to server is not established properly. So, the internet can’t be accessed by the GAME.
This is a CLIENT-SIDE error, this has nothing to do with SERVER. The internet connection is not SECURED in CLIENT-SIDE.
NOTE: Whenever the POKEMON MASTERS TEAM restarts their SERVERS, this ERROR occurs in only few devices and will be automatically fixed after (~1 Day).
But, this can be FIXED on the same day using VPN in mobile device. I personally use SAMSUNG phone and by default it is has SAMSUNG PRO MAX VPN app which’ll do the trick.
You can also download and run that app by using the below link
You can use any VPN app and fix this ERROR 20103 immediately!