ANSWER:

If they got married thinking that their marriage is legitimate and valid, their marriage is valid. Once they know the Islamic ruling, they must rectify it and renew the marriage. 

I have been asking u about nikah in the sub cont.U said it is not valid.Does that mean everyone one here is living in zina?We have some real scholars here who have not objected to it because the wali gives his full consent.U said renew the marriage contract but i am 16 and cant tell anyone to do it.So can i stay quite about it and just make dua to allah to forgive us all& show us the right path?

Fiqh of Marriage, Invalid Marriages, Marriage Contract | September 10, 2021 10:33 am
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If a persons wedding was arranged by parents where there was free mixing. Can this be regarded as kufr? Some scholars quoted Nisa 4:140 and Luqman 31:6 from Quran as saying Allah’s verses are being denied and mocked. Because if groom and bride commited kufr by attending this gathering before consumating then it means that marriage is annulled?
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I live in a community that isn’t pious and islamic. Me and my family dont know any pious women. How should I get married? Is it permissible to contact a pouis sister online for marriage through email, twitter or instagram? So I make an appointment to meet her with her dad, would this be permissible? If this isn’t permissible, does that mean that I can’t get married? What is else can I do sheikh?