This is a temporary error that we've identified and are currently working on. We expect to have this under control shortly.
As always, no need to worry - your data is safe, but we are currently experiencing problems uploading CSV files and with deleting linked accounts. Keep an eye on this article for updates as they occur.
Symptoms that may be experienced: Deleting an account, it is removed from the linked accounts list. Then after navigating to the "Overview" page and the account still shows up there. Then when navigating back to "Linked accounts" and the account still shows up there as well.
CSV upload, email may or may not be sent, but CSV never uploads.