How do you "restart" receiving Firebase Alerts on short code 44398

I often use Firebase phone auth in my applications. I have one user who religiously sends "STOP" to all text messages. Big oops. Now she can not login to any application using the system...

Short code phone # = 44398

If the user types "STOP" to that short code, the system responds with:

Firebase: You are opted out and will receive no further messages. For HELP, reply HELP. Msg & Data rates may apply

Type "HELP", the response is:

Firebase: For more info: - Msg&Data rates may apply.

My question. How do you "RESTART" the service? The Firebase support page offers no help here.

I've tried "GO", "RESTART", "UNSTOP". All of those fail.

Here's a posting on how Twilio addresses the topic. Twilio uses START, YES and UNSTOP to restart a service (on long code source). Each of those fail here.

Twilio also provides a link to standards for short code expressions., but I'm not seeing anything on restarting a service.

Here is a screen shot (of my phone):

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