I’ve found another organisation that doesn’t recognise the Monzo current account details.
Just sold some shares through the Equiniti Shareview service. The web site asked if I wanted a cheque or a BACS transfer. I chose BACS and gave them my Monzo account details. When the trade went through, I got this message:
Unfortunately, we have been unable to verify your bank details using our automated
systems. We will, therefore, post a cheque to you on the settlement date above.
i’ll get in touch with them to suggest they update their BACS file, but it’s probably too late to fix it for this transaction.