Your callback URL (Redirect Uri) is wrong, it should be:
https://businesscentral.dynamics.com/<tenantid>/<environment>?page=70319480
Where tenantid and environment are replace with your values.
Example: https://businesscentral.dynamics.com/4886f4b5-5d76-422c-af66-f09fb2d1f5cd/demo?page=70319480
The app should have generated that for you?
Thanks for the feedback. Its working !
I had to fill the information manually