How does a dependent sign up for a BAM account?

I am a dependent, and my spouse is the subscriber.

The sign up procedure from BAM (Blue Access for Members) asks for my details, including member ID. I, the dependent, do not have my own member, but when I give my spouse's, I am told that my personal information doesn't match what is on record for that ID. That seems like a reasonable thing for the system to tell me, but it doesn't help me create my own BAM account.

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