Unable to Login to Instagram using a Facebook account

My Instagram account was created from Facebook, so it only has an FB login. I can login to the mobile and the website using these credentials. I

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Can't I login to my Instagram account on a website or app. What to do?

My Instagram account was linked with Facebook and I deleted my Facebook permanently.Now, my Instagram account isnt opening. how to get it back? - Quora

Anyone knows whats the problem? I can log in on PC but if I try App I get this error and can't log in with Facebook too.. : r/Instagram

Instagram and Facebook CRASH worldwide as angry users report they are unable to 'log in' on mobile phones - Mirror Online

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Unable to Login to Instagram using a Facebook account - Blog2Social Community