nostr:npub1g53mukxnjkcmr94fhryzkqutdz2ukq4ks0gvy5af25rgmwsl4ngq43drvk I had michaeljburgess@iris.to and web3wizkids@iris.to on my account witch all of a sudden became invalid addresses

I #ASKEDNOSTR why this was and nostr:npub1eseajvcuqgk6dy98zndje76hcd485zwmhjx4ztgnw4yruq68lhxq45cqvg got back to me kindly and explanted that there not found

https://iris.to/.well-known/nostr.json?name=Web3WizKids https://iris.to/.well-known/nostr.json?name=mIchaeljburgess

could you explain why and help me fix this please