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Marking your own post as Solved may prevent others from trying to help because they think you have fixed your problem.
See the Apple Support article(s) below.
ASC YouTube for what to do if you can’t make a purchase on your iPhone -
App Store, iTunes Store, or other Apple services - If you can't connect *
Some things you can try. Do you have access to another WiFi network where you can try? That has worked for several people.
Try a restart.
Try a forced restart. See the section towards the end of the article.
Reset Device. -