Jira webhook api not working | Need to register a webhook for user

I am trying to register webhook for jira app user, user is authorised using oAuth and i have bearer token, cloud id, domain of user to access any needed api,
currently trying to resgiter a webhook for user to get notification for events but its giving error like “The app is not installed on this instance.” when trying with bearer auth token, please provide suggestion to make it working, please check attached screenshot,