@brennank Ensure your AP17 is close to your main AP that is wired into the network to make an "over the Air" connection. If you continue to have issues trying to connect the AP17 please reach out to support.
Thanks @GThiesen but doesn't having a PoE Uplink disable Mesh? The directions for getting a mesh point online seem to indicate that in the presence of an ethernet uplink the radio won't join as a mesh point
@brennank The only way to power the AP17 is through ethernet and using a mid-span injector. This will be the only way to get the mesh up and running. With all other AP's plugging in an ethernet cable disables the mesh feature. I would recommend working with support to find out what may be giving you issues.