ACS 5.3 authorization with Juniper WXC-3400

In the process of migrating from ACS 4.1 to ACS 5.3. Authentication works fine, but having issues with authorization on the Juniper WXC-3400 devices. In ACS 4.1 we were passing TACACS+Shell (exec) Custom attributes Privilege level=15, which allowed a user to login with read/write privileges. In ACS 5.3 tried setting the Shell Profiles common task to 15 for both Default and Maximum (one at a time, and together), as well as setting the Custom Attributes for priv-lvl=15 (with and without Common Tasks set).
A capture shows Auth Status: 0x11 (ERROR).
Any ideas?
Thanks in advance!

No.     Time               Source                Destination           VLAN Protocol Info
18 09:14:00.268166580      WX_Juniper             ACS_5_3           TACACS+ Q: Authorization
Frame 18: 107 bytes on wire (856 bits), 107 bytes captured (856 bits)
Ethernet II, Src: Cisco_cd:46:af (00:07:7d:cd:46:af), Dst: Ibm_fe:9a:63 (5c:f3:fc:fe:9a:63)
Internet Protocol, Src: WX_Juniper (WX_Juniper), Dst: ACS_5_3 (ACS_5_3)
Transmission Control Protocol, Src Port: l2c-control (4371), Dst Port: tacacs (49), Seq: 1, Ack: 1, Len: 49
TACACS+
    Major version: TACACS+
    Minor version: 0
    Type: Authorization (2)
    Sequence number: 1
    Flags: 0x04 (Encrypted payload, Single connection)
    Session ID: 1491582254
    Packet length: 37
    Encrypted Request
    Decrypted Request
        Auth Method: TACACSPLUS
        Privilege Level: 1
        Authentication type: ASCII
        Service: Login
        User len: 8
        User: stmartin
        Port len: 7
        Port: console
        Remaddr len: 0
        Arg count: 1
        Arg[0] length: 13
        Arg[0] value: service=shell
No.     Time               Source                Destination           VLAN Protocol Info
     20 09:14:00.271608140 ACS_5_3       WX_Juniper             TACACS+ R: Authorization
Frame 20: 76 bytes on wire (608 bits), 76 bytes captured (608 bits)
Ethernet II, Src: Ibm_fe:9a:63 (5c:f3:fc:fe:9a:63), Dst: Cisco_cd:46:af (00:07:7d:cd:46:af)
Internet Protocol, Src: ACS_5_3 (ACS_5_3), Dst: WX_Juniper (WX_Juniper)
Transmission Control Protocol, Src Port: tacacs (49), Dst Port: l2c-control (4371), Seq: 1, Ack: 50, Len: 18
TACACS+
    Major version: TACACS+
    Minor version: 0
    Type: Authorization (2)
    Sequence number: 2
    Flags: 0x00 (Encrypted payload, Multiple Connections)
    Session ID: 1491582254
    Packet length: 6
    Encrypted Reply
    Decrypted Reply
        Auth Status: 0x11 (ERROR)
        Server Msg length: 0
        Data length: 0
        Arg count: 0

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