Can't create bundle ID and deploy to app store

I’m following the suggested format on adalo (com.appname.ios), but I’m getting an error - An App ID with Identifier ‘’ is not available. Please enter a different string]please-enter-a-different-string. can anyone help?

Only one bundle ID can be made, as each is unique. “com.facebook.ios” is taken, for example, because an app already is using that. You need to pick a new word between “com.###.ios”