https endpoint Amazon SNS subscription registration is not allowed. I'm attaching the ID, so please check it.

api call route : https://us-west-2.console.aws.amazon.com/sns/v3/api/sns

and parameter is {"headers":{"X-Amz-User-Agent":"aws-sdk-js/2.444.0 promise","Content-Type":"application/x-www-form-urlencoded; charset=utf-8"},"path":"/","method":"POST","region":"us-west-2","params":{},"contentString":"Action=Subscribe&Endpoint=https%3A%2F%2Fgini.fun%2Fapi%2Femail%2Falarm&Protocol=HTTPS&ReturnSubscriptionArn=true&TopicArn=arn%3Aaws%3Asns%3Aus-west-2%3A675770383145%3Agini_bounce_rate_alarm&Version=2010-03-31","operation":"subscribe"}

please help me.

I assume that you want to subscribe to SNS Topic using an HTTPS endpoint that ends with an error in AWS Console. Is it the case? If yes, you probably don't have permission to execute this action. Please check your permissions in IAM.

My account is the root user. Is there anything else to set the authority for?

Is the API for subscription private or public? Is it protected by any auth method?