If you’re on a piefed instance, or are administrating one, make sure your instance is able to receive Fediverse Auth messages

Piefed defaulty rejects DMs from new actors, but this can be fixed in the admin interface by marking auth.fediverse.events as a trusted instance

Edit: trusted actor -> trusted instance

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You can also test if your instance works by clicking on the emojis on the Canvas page ✨