You need to add IP to the whitelist. Refer to help below. Look out for white list.
Do confirm that you've whitelisted the server's IP address. (QMC > Virtual Proxies > Default > Advanced). By default when you install Qlik Sense Server, it will install to the address ServerName. So the shortcut on the desktop will point to the servername, e.g. in my local VM: https://QlikSense.domain.local/hub. In order to access the Hub via different URLs then you will need to whitelist the URL.
If that has been done then please post a screenshot of what you see when you hit the https://IP/hub URL.