AAD, Mobile App, browser not working

We have setup AAD for authentication for our on prem powerbi server to work for mobile access.

the app works great

if we try and access the published URL from a web browser we get the following error

AADSTS50011: The reply URL specified in the request does not match the reply URLs configured for the application: '4f813c3e-4a0b-4f75-9924-f2cd4870645b'.

we can access via the internal URL still, however it would be good to access via the external setup