The question seems pretty straightforward: if the vendor says that the device can only authenticate against a Radius server then it is not capable of authenticating against a TACACS server.
It may help to understand that TACACS and Radius are two different protocols that are commonly used to do authentication (and sometimes authorization and accounting) for network devices. Some devices (like Cisco) operate just fine with both protocols and some devices (apparently like the one you are working with) operate with only one.
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We have configured the outside and inside Interface with official ipv6 adresses, set a default route on outside Interface to our router, we also have definied a rule , which also gets hits, to permit tcp from inside Interface to any6.
In Syslog I also se...