iphone 6 email notification issue with outlook.com account
I have an iPhone 6 OS 8.4.1. The problem is that when I receive mail in my outlook.com account ( it's alright in my other 3 accounts: gmail, yahoo, iCloud ), I don't receive any notification when the screen is locked. I have tried these things to fix the issue. I have powered off the phone. I have shut down the phone by holding down the home button and the power switch simultaneously. I have taken the phone to an Apple store to have a genius look at it. His recommendations were to Reset all the settings. Of course we both verified that everything was properly set in the Notification settings for the account. He also said that the reason it could possibly not be working is because if I'm checking the issue by sending an email to the account in question while using my phone, I may not be locking the screen quickly enough before the email is being received from the outlook server. So to validate this theory, I sent an email from my iMac to the outlook.com account and I still did not receive any notification! His last suggestion was to download the outlook.com App from the App store. I have not done that as of yet because that does not address the issue. It only circumvents it. Why is my iPhone 6 not able to show notifications in locked screen when getting mail from my outlook.com account? Help!!!! BTW, I receive the email in the outlook.com inbox.
iPhone 6, iOS 8.4.1