Currently the #1 Battle Royale out, the Free to Play title has taken gamer's everywhere by storm and is coming to a mobile device near you.

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This is the full Battle Royale experience on the go! Same gameplay, same map, same weekly updates.

Requires an internet connection and iOS 11 on iPhone 6S/SE, iPad Mini 4, iPad Air 2, iPad 2017, iPad Pro devices or later.

I need to know that if I run Fortnite on my Note 9 with an Android VPN running in the background, will it get my ID banned?

From what I am reading they do use a tool to detect and ban VPN users.
I did find this article it may be of use to you.
So its a chance, you do have the possibility of catching a temp at least.
www.comparitech.com/blog/vpn-privacy/best-vpn-fortnite/