There is a field in the Metaswitch Subscriber Management section, Line State Monitoring, this can be found on every line porgrammed in the Business Group, located in the services tab.
This is defaulted to 10 monitored lines, the 500S has 32 buttons. If you set the Line State Monitoring to 32 in the Metaswitch, all the buttons on the side car will go into an active BLF mode and will turn green and function properly.
Took me awhile to answer my own questions, doesn't seem like there is a lot of Metaswitch users on this forum, so if anyone has any questions feel free to send them my way so I can assist in sharing Metaswitch/Cisco SPA knowledge!
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