Augmented Reality (AR) button not found? Iphone6


I have the game on my Iphone 6. I’m currently updating my phone to the latest ios 11.4, but just in case that doesnt fix anything. I currently cant see the AR button on my Iphone, I know a lot of android users are having this issue, but I cant find anything about apple, any suggestions? I will update about updating the IOS once it is done.