What is the "Confirmation Code" that the EUICC QrDownloadActivity requests?

As forum.fairphone.com/t/125278 explains, I've been unable to activate my eSIM, because my OEM's AOSP 15 distribution's com.google.android.euicc/com.android.euicc.ui.activation.QrDownloadActivity activity requests a "confirmation code" which my cellular provider (HUTCHISON 3G UK LIMITED's SMARTY brand) does not appear to provide: [\[1\]] [\[1\]]: https://meta.stackexchange.com/revisions/412516/2#:~:text=I 've%20recently%20come%20across%20a%20situation%20in%20which%20I%20want%20to%20ask%20about%20%5Bwhere%20to%20ask%20about%5D%20where%20to%20report%20a%20cellular%20provider's%20support%20staff%20(egregiously)%20ignoring%20the%20content%20of%20my%20messages%2C%20and%2C%20instead%2C%20responding%20to%20me%20with%20LLM%20summaries! So that I can confirm that it's either not been provided, or so that I can ascertain what I've done incorrectly, what, specifically, is this activity requesting? (The more technical, the better: I'd like to be able to cite a standard, and/or AOSP code, if possible. However, any answer is better than none, so I'll be grateful regardless.)