Can't activate root domain for my amplify app

Hi there!
I had my react app deployed and worked successfully, yesterday I updated my git repo, but my web site didn't work as I expected, so I checked my amplify console for issues and found something weird like my domain name disappeared, but it still worked correctly as I see it now. So I decided to add my custom domain again, but got an error "One or more of the CNAMEs you provided are already associated with a different resource" at the last step of domain activation. But I had only one amplify app (I don't have any records at CloudFront). Then I deleted that amplify app, deleted all dns records for my domain in Route 53. Then I've created a new amplify app (now I have only one app) but I still get the same error for domain activation step. Now I excluded root domain for my app and try to activate a sub domain like sub.mydomain.com. I don't get any errors but activation is still being processed, but I'm sure it will be completed. I use Route 53 and I'm sure that my domain is delegated to it. I assume I can activate a sub domain, but what is wrong with my root domain? Amplify automatically adds dns records it needs, so it is not my mistake. Can anyone please help me activate my root domain