They also very briefly tweeted "@namedotcom We sent you a DM, can you please respond with a live support number?"

Seems like they were having trouble contacting a human and had to resort to public shaming, and then deleted it once they got through.

namedotcom: We are working with the owners of this domain to address this issue as quickly as possible.

notionhq: Heya! Could you let us know where you're messaging us to address this?

https://twitter.com/NotionHQ/status/1360238956772642818?s=20

Heh, mailing to <something>@notion.so probably wouldn't be working at the moment.