Although our app works fine on iOS, the Android version doesn’t get past the splashscreen.
It seems that URL’s get messed up on the Android version:
Android log:
D/Capacitor: Loading app at http://https:// ourdomain/
Does anyone have an idea what could be the cause of this problem? 
The capacitor.config.json file looks als follows.
“server”: {
“hostname”: “https://ourdomain/”
}
The problem is you have hostname set to "https://ourdomain
https is not part of the “hostname” value, that would be the protocol.
remove the https and keep it as "ourdomain"
Thank you @mhartington!
Getting the next error now, so I think this one is fixed
Also worth noting, you should not use https:// for the protocol in the app. Since there is no tsl setting on the local webserver