iphone 7 had portrait mode now does not

Only the iPhone 7 Plus supported portrait mode. Based on your boilerplate, you're using an iPhone 6

yzarc123 Said:

"iphone 7 had portrait mode now does not"

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Use of Portrait Mode:

Portrait Mode is not an option for all apps. So, was this working before?

Rotate your Screen:

What happens when you remote your screen 90 degrees? Does it then work? If you cannot rotate it, then go here, and set it so it can rotate: Rotate the Screen on your iPhone or iPod touch - Apple Support