We were discussing this here few days ago;
https://community.monzo.com/t/legacy-bank-updates-fintech-and-innovation-at-high-street-banks/48365?u=sc95
Link from Barclays website;
https://www.barclays.co.uk/security/fraud-prevention-features/?om_u=Nsj-g2&om_i=_BbrdF1B9svkg7f&WT.mc_id=EMAIL13310fraud2&campaign=EMAIL13310fraud2