For the [Domain Mapping] plugin usage, a bug is experienced for the WordPress multisite installation at https://ivalde.no secured with a wildcard SSL certificate.
The plugin becomes useless as the mapped domains can’t be secured for the various administration logins.
For the domain camelliaforeningen.no as an example, the DNS record A is routed to the multisite installation IP, and within the domain backend [Tools : Domain Mapping] section, the domain http://camelliaforeningen.no is then mapped to the subdomain http://camelliaforeningen.ivalde.no
For the domain administration login to be secured then, utilizing the wildcard SSL certificate, within the superadmin backend [Network Admin : Settings : Domain Mapping] section, the [Administration mapping] option is set to [original domain].
The domain DNS setting however overrides this superadmin backend setting. When the network admin login page at https://camelliaforeningen.ivalde.no/wp-login.php is then entered, that address is routed to the domain admin login page https://camelliaforeningen.no/wp-login.php resulting in certificate error.
Please review your plugin, for this bug experienced to be fixed.