Instagram app won't let me log in?

So this has been going one for months now. The Instagram app won't let me sign into any of my accounts on my phone and my iPad, but it lets me sign in on my old iPhone and other people's phones. Yes I can sign in on the internet. Nothing's wrong with my passwords. Please, I need help.

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Is it impossible to animate on an Apple IPhone? I mean I don't have the money to buy an iPad or anything, So is it possible?

Is it impossible to animate on an Apple IPhone? I mean I don't have the money to buy an iPad or anything, So is it possible?

Read more: Is it impossible to animate on an Apple IPhone? I mean I don't have the money to buy an iPad or anything, So is it possible?