Access Email (outlook) using oauth2

Hi all,

thanks for all the guidance.
we have plan to access mail using outlook REST APIs with oauth2 authentication.
I am trying to understand how we can do it in our environment.

actually I have webMethods IS 9.12 and APIGW 10.1
is there any limitation here?

Could you guys help me to propose the best architecture how we can achieve it?

Thanks.