My online banking no longer works on my new Mac
I've just updated to Ventura 13.3.1, and now my digital banking online (which I've used for years) will not work - every time I log in to make a payment / transfer etc, it asks me to log in again (on a broken loop).
Money 'trapped' and stuck in limbo. I've been told by the bank to try a different browser (always used Safari). So, is this an Apple issue? This Mac is brand new (bought 1 month ago) and have had nothing but trouble and frustration from it since I took it out of the box!).
Any help out there? Thanks in advance (ps. I'm not 'technical'!)
MacBook Air 13″, macOS 10.15