I did the same to Shopify about 12 months ago or less and their response was , first please remove the takeover from your panel and then second we are aware but wont fix.

It is absolutely bewildering that they wouldn't take this seriously. The owner of my takeover tried to add the domain to their panel and they couldn't. This adds a whole new level of customer service to their backlog which should essentially be mitigated by an automation of sorts via a txt record or cname confirmation. Seems to me that they are more interested in not fixing it but happy to waste hours of their agents trying to fix such takover problems.