Just tried buying an accessory from carphone Warehouse but told they don’t accept Monzo cards. It refused to work contactless and with PIN. How disappointing for them - sale lost!
The guy working there told me that they haven’t updated their system yet!
Woah 
that’s not good!
I’d send an email over to acceptance@monzo.com with as many details as you can provide👌
This definitely shouldn’t be happening anymore 
I’ve had my monzo work with CPW online but never tried in-store.
Already have sent email. Just wondering if it was just the Northwich store or all CPW?
I feel like we would have known by now if it were all Carphone Warehouses.
There are a couple of other threads about problems with Carphone Warehouse.
According to Simon, their systems still run on DOS! That probably doesn’t help.
Used my card fine just before Christmas (for £1 charge credit checking rubbish) when picking up a SIM for one of the kids.
They then proceeded to set up the DD from a completely different bank account they had on file … 
They definitely do accept our cards, and in fact have done so since the prepaid days. It sounds like an isolated incident - I would try a different branch perhaps.
It definitely worked in store for me