I don't see the instances and I don't see anything AWSAccount1 created in my AWS account.

Is there a filter on the instances ? Click clear filter to check. Also, have you logged into the right account? It sounds like you are logging in with the root user so potentially you are logging into the parent account. Check AWS Organizations to make sure you can see your AWS Org parent account and the account you have invited to your org, and check the account ID in the top right to make sure you're logged into the correct account.