All users should have received a notification this morning to say that we are experiencing some issues with our cards being used for contactless travel with TfL.
When using your card for travel, the money for the journey is not taken immediately, but simply authorised “offline” for later settlement, so companies like TfL (or maybe also when spending money while flying) can settle the amount at the end of the day.
Unfortunately these specific transactions are not being authorised at the moment. We are investigating the reason and will resolve it as soon as we can.
Please make sure you have an alternative card with you if you are travelling on a train or bus today.
Other transactions, whether chip-and-pin, contactless or online, will work fine and are not affected by this issue.