In order for TACACS+ authorization to function, TACACS+ authentication must be enabled first. See Enabling TACACS+ authentication.
Use the following syntax to configure RADIUS authorization on the local router.
config>system>security
tacplus
authorization
no shutdown
A:ALA-1>config>system>security>tacplus# info
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authorization
timeout 5
server 1 address 10.10.0.5 secret "test1"
server 2 address 10.10.0.6 secret "test2"
server 3 address 10.10.0.7 secret "test3"
server 4 address 10.10.0.8 secret "test4"
server 5 address 10.10.0.9 secret "test5"
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A:ALA-1>config>system>security>tacplus#