At mentioned by others, that phone is not compatible with Republic as it is a carrier specific model and software build.
Carrier specific phones , even if “carrier unlocked” are not compatible with Republic Wireless.
This certainly can be confusing and frustrating, especially when buying from a 3rd party who labels the phone as “can use on any carrier” or similar.
But the very unique technology and nature of Republic’s service requires a certain level of compatibility and certain requirements to be met, thus, only the devices listed on the supported phones that R.W has personally tested and approved for their service will function.
You do have some options moving forward:
You can sell the phone (I recommend on Swappa.com) and then purchase a compatible phone to use on R.W.
If you wish to keep the phone, and it is infact “carrier unlocked”, you are free to switch to a different provider. Expect for Project Fi, as that phone will not work on Fi. (Fi have only a few supported phones).
As Southpaw mentioned, we are customers just as your self. We have no access to Help Tickets, and can only start to help fellow customers based on what information one gives in their first post. There are some users, like Southpaw, as well as other Experts from R.W that do monitor these forums, post as well, and do have access to things normal users do not.
I wish you well.