Hi Austin,
I do not see any challenges with this connectivity. This should work unless there is an issue with fiber/module.
As you know the Meraki devices will appear dormant on the dashboard until they start communicating with the Meraki Cloud. I understand we shall look towards resolving this.
A few ideas could be?
1. Check the Uplink port configuration/status on MS120-24.
2. Maybe you can try to connect the MS120-8 directly to one of the copper ports on MS120-24 port to see if the device is able to communicate with the cloud.
Regards,
Ajit
AjitsNW@gmail.com
www.ajit.network