Email notification needs to open app...not a browser page

When receiving an email regarding on my iPhone and I click the banner it opens a browser and asks me to download the app. I have already done this of course. I would like when I receive a email on my iPhone that the app is opened once I click the banner in Outlook to the task the rep needs help with. Instead, I have to open the app after receiving the email to find the task the rep has a question with in the notifications section. This gets tough since I have multiple requests from different employees each day.