odd message came up when opening the youtube app

Hi all. About half an hour ago, I opened the youtube app on my phone, which is running the latest IOS. Right after I opened it, I got a message saying that the iTunes store is unable to process purcheases at this time. The only button that came up was an ok button and after I double tapped it, the youtube app worked as it always does. Is this a message that I should be worried about? Have I harmed my phone by hitting the button after this dialog?

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not at all

it's entirely possible that your iPhone was checking for purchases and other updates at that exact moment, and it couldn't contact the appstore for whatever reason. I've seen that happen a time or two. I don't think you have a single thing to worry about.