Hiya,
I'm sorry to hear this. It must be so stressful, especially since you're going to university. There must be a valid reason why you have a CIFAS marker: did you willingly give your debit card and online banking credentials to someone claiming to offer you easy money? Did you receive and transfer huge amounts of money? If so, then you may have a CAT 6 marker (for misuse of facility, i.e, your bank account) on your name, which lasts for 6 years. You will find it difficult to get any form of credit since most lenders and banks are CIFAS members and will see your name flagged up with a fraud marker, which will result in your application being declined. I think it's best you tell us what happened in more detail since it's not normal for you to have a fraud marker for no reason.
How do you know you have CIFAS marker? It could be that you may not be on the electoral roll at your address or you have a thin credit file, which can lead to your applications being declined. I'd stop applying for bank accounts because it can affect your credit rating if you apply for too many accounts at once (plus, the banks may get suspicious when they see your file full of rejected applications for accounts, which may result in a future application getting binned). You will need to do a data subject access request form (DSAR) where they will tell you which lender has put the marker on your name, and what type it is. Here's the link to the form:
https://www.cifas.org.uk/contact-us/subject-access-request/subject-access-request-form.
If it was a mistake, I would complain to the lender who put the marker there, and if they don't resolve it, then submit a complaint to the financial ombudsman. However, if you were complicit in fraud, then I'm afraid they were right in giving you the marker.
Sorry for this essay, there isn't really much I can do to help. AlI I can suggest is getting a prepaid card (not a Starling and Monzo bank account since they, I believe, are now members of CIFAS) though I'm not too sure whether you can get your student loan paid into a prepaid card. I'd check that with Student Finance if I were you. The link to prepaid cards is here:
https://www.moneysavingexpert.com/credit-cards/prepaid-cards/.
Hope this helps