Hi, this was Tom’s response when he was asked about this -
When other members of the Monzo team have been asked about this more recently, apparently they’ve said that this isn’t being worked on at the moment.
There’s 3 main ways to contact Monzo at the moment - through the in-app chat, by email (help@monzo.com) & by phone (using the number on the back of your card. So obviously if you have access to the internet (which you’d need for the portal), you’d be able to send an email. Having said that, even if Monzo don’t build a ‘full’ online banking site, I expect they’ll add a way to report lost / stolen cards on the site in the future…