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Thousands of Monzo customers are unable to access their accounts via its app due to a major technical issue.
When some customers try to log in, they are met with the message: 'We're experiencing issues. Your app will not be fully functional.'
Meanwhile an automated message via the phone says: 'Don't worry, your money is safe and your card should work as normal.'
In a post uploaded to X, Monzo writes: 'We've identified some issues affecting Monzo and activated Monzo Stand-in, our fully independent back-up bank.
Banking app Monzo posted to X, previously known as Twitter
'As a result, you can still make card payments, withdraw cash, freeze your card, send and receive bank transfers, and more.'
DownDetector shows there was a sharp rise in outage reports for Monzo from just after 12pm today, with thousands of people reporting issues.
A Monzo spokesman told the Daily Mail: 'We’re currently experiencing a technical issue and are working to resolve this as soon as possible.
'In the meantime we've moved into our back up system Monzo Stand-in and customers can still do most things on their Monzo app including sending bank transfers and making card payments and ATM withdrawals.'
Monzo, founded in 2015, has more than 15m retail customers and recently announced it was the first digital bank to reach one million business customers.
Earlier in the week, it was revealed its chairman is to step down after seven years at the digital bank.
Industry veteran Gary Hoffman, best known for being put in charge of Northern Rock after its government rescue during the financial crisis, will quit in early September.
He will be replaced as chairman on an interim basis by Monzo board member Karen Peacock, pending the search for a permanent replacement.
Monzo, which has its hot coral debit card, is one of the biggest winners in the current account switching stakes.
Recent figures from the Current Account Switching Service show it hoovered up 32,066 switchers in the first three months of the year, putting it in third place behind Lloyds and Nationwide Building Society.
That comes despite it not offering switching bonuses like many of its rivals.
Monzo doesn't typically offer cash bonuses as it relies on app features, budgeting tools, and organic customer growth.