My own domain blocked by "AI-Driven Threat Detection"

Title says the issue. Woke up one day to find most of my self-hosted services were inaccessible (Mattermost, SearXNG, MeshCentral, CopyParty, etc...), but strangely only on some devices. Spent forever trying to diagnose the problem, only to find out that it was NextDNS's "AI-Driven Threat Detection" that was blocking my domains. No clue why it might have done so, other than wrongly basing its decision on the name of my domain? Not sure.

How can falsely flagged domains be removed from NextDNS's "AI-Driven Threat Detection" (other than just whitelisting it for myself in the NextDNS admin interface)?