@YogeshMct Thanks for asking question!
Could you please try to open SSH session directly by pasting the following URL into your browser and replace <app-name> with your app name.
https://<app-name>.scm.azurewebsites.net/webssh/host
Also, note that If you're not yet authenticated, you're required to authenticate with your Azure subscription to connect.
You may also Open SSH session from remote shell
Sharing detailed document link below:
Let us know.