How can I log in to MYAsus on the iPhone by using Microsoft account

[Falcon_ASUS]

@Neayy 
Are you saying that you have installed the MyASUS app on your iPhone and you want to log in using your Microsoft account? 
Could you please provide a screenshot of the login screen of your current account on your iPhone's MyASUS app so that I can first verify the login account screen? 
Thank you.