The bank said they were are aware some customers were having “issues” logging into the new app.

In a post on X, formerly Twitter, Santander added: “Our team are working hard to get this resolved as soon as possible, as soon as we have any further updates we will let you know.”

They said in the meantime, customers were advised to use their website for banking needs.

On social media, one person wrote: “Why is my app not working? It doesn’t help when you just put an ‘oops’ message.”

Another penned: “Good morning. Is your mobile banking app down. I have been kicked out of it and an error message displays.”

A third reported: “My Santander app has updated, I cannot log in now, just says. ‘Something went wrong’. I’ve tried using mobile data and WiFi. Uninstalled the app, reinstalled…nothing! Frustrating, when is this being fixed?”

“The new app doesn’t work on either of my devices, when I try to log in it says, ‘That didn’t work’, I have restarted my devices,” another said.