Thank for you doing so much work on this, it's been so useful.
I have what might be a bug or it might be that the exchange is too niche. https://autoao3app.firebaseapp.com/#/tardis_festivities_2022 doesn't show anything in Grouped by Fandom. It does have a tag set, and the sign-up includes a Fandom field in which you can only choose fandoms from the tag set. However, the tag set only includes fandoms, it doesn't include characters or relationships. It's also possible to include multiple fandoms in one request and to repeat them.
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I have what might be a bug or it might be that the exchange is too niche. https://autoao3app.firebaseapp.com/#/tardis_festivities_2022 doesn't show anything in Grouped by Fandom. It does have a tag set, and the sign-up includes a Fandom field in which you can only choose fandoms from the tag set. However, the tag set only includes fandoms, it doesn't include characters or relationships. It's also possible to include multiple fandoms in one request and to repeat them.