The following command line:

kcreg update -s 'redirectUris=["http://localhost:8980/myapp/*"]'

Is parsed into the following tokens:

    kcreg
    -s
    redirectUris=[http://localhost:8980/myapp/*
    ]

Double quotes have disappeared, and the ending ] character has been placed into a different token.

Proper tokenisation would produce the following:

    kcreg
    -s
    redirectUris=["http://localhost:8980/myapp/*"]