Atlassian Connect Cloud app failed to register

Hi ,

I am trying to develop a confluence cloud app following https://developer.atlassian.com/cloud/confluence/getting-started-with-connect/

The app was running fine and suddenly stopped working

npm start , throws below error

Registering add-on...
Failed to register with host https://r******.atlassian.net/wiki (200)
{"type":"INSTALL","pingAfter":300,"status":{"done":true,"statusCode":200,"contentType":"application/vnd.atl.plugins.task.install.err+json","subCode":"upm.pluginInstall.error.response.exception","source":"https://428e-1-39-18-19.ngrok.io/atlassian-connect.json","name":"https://428e-1-39-18-19.ngrok.io/atlassian-connect.json"},"links":{"self":"/wiki/rest/plugins/1.0/pending/860e6788-2291-4481-a129-065b2a3c87ba","alternate":"/wiki/rest/plugins/1.0/tasks/860e6788-2291-4481-a129-065b2a3c87ba"},"timestamp":1629879772317,"accountId":"60f96cfcecadb10069f316ba","id":"860e6788-2291-4481-a129-065b2a3c87ba"}
Add-on not registered; no compatible hosts detected

This is happening every now and then , some day working fine and other day just throwing errors.

Can someone give me a permanent solution to this.

Thanks