How can I remove the manual authentication when getting toke

Hi,

If the application is a web app or windows app or mobile app, then user consent is always required, that's how MS Graph works.

It's user's data you are aceessing thru MS Graph, so that user has to login and provide consent. so you will always see user login form when you start.

if you need to do some task in background i.e. not related to some users data but some job or admin process, then here is the example how you can do it in a proces:

https://developer.microsoft.com/en-us/graph/docs/concepts/auth_v2_service