Please note that the mpris interace also allows specifying the ‘name’ attribute. Looking at your manual review request, you have an unusual dbus name of simply ‘olivia’ which might indicate why mpris didn’t work since your snap’s name is ‘olivia-test’. Please try:
slots:
mpris:
name: olivia
apps:
olivia:
...
slots:
- mpris
This will allow binding to org.mpris.MediaPlayer2.olivia.
Is there any reason why you chose ‘olivia-test’ as the snap name instead of ‘olivia’? As it stands, to pass automated review you will need a snap declaration for use of ‘olivia’ with the mpris interface since your snap is named ‘olivia-test’, but if it was named ‘olivia’, you would not.