My Monzo card was declined when paying for shopping and requesting cash back from a self service check out in Morrisons (using chip and pin).
Strangely I got no notification via the app to tell me this.
When repeating the transaction without cash back, everything worked as expected.
@anon93823344 Monzo cards whilst in Prepay won’t support cash back. As soon as it’s a proper bank it won’t fail.
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Yep. sure! I’ll add this to our known bugs/ issues pinned post for starters and add to the FAQ’s on the website too 
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Hi Guys, Tried to use Monzo on Birmingham M6 Toll road, contactless didn’t work, not sure if putting the card into the toll booth would have worked as I switched to backup card.
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Thanks for sharing this, did you get an error message in the app at all?
nothing, the contactless reader just didn’t work, worked fine with my backup card though.
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I guess the terminal was offline then, in which case this won’t be an issue once the debit cards are available.
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Just an FYI - card not accepted at the parking payment terminals at Churchill Square in Brighton.
Thanks for sharing this, it is a known issue that’s related to prepaid cards (so it won’t be a problem soon, once Monzo launch their debit cards 
) -
Asda seeks authorisation for £99 before it dispenses fuel. The decline might just be because prepay isn’t designed to be accepted in unattended terminals though. I have had similar declines in unattended automated terminals even for low value transactions within my balance. (parking machines).
The current account debit card shouldn’t have these issues.
It is not to do with the value of the transaction but due to the category of card (prepay not debit) and that Monzo require online authorization in real time (rather than offline authorization in batch mode).
I just had contactless declined at Tesco, perhaps because I haven’t used the card for two weeks?
That’s definitely not the reason. 
Did you get any message in the app?
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Nothing, just that it’s been declined, I had to use pin and then it worked… I wonder why?
Then Naji’s response in other topic is the best explanation:
Query on functionality
Daft question perhaps, but why are some entries on this site in blue and the rest black?
Blue relates to links and other references. So this includes quotes from other posts.
Black is just the normal text.
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This might be a known issue, but it seems golden ticket distribution thru FB messenger is not working. Tried twice, with two different tickets with my friend and both times it thinks the un-used ticket has been expired. When trying the second ticket thru email, it worked. Could be worth checking up on this? I think this has been mentioned somewhere else in the forum too.
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I reported this to support recently. It seems that Messenger is stripping the information off of the end of the link that actually has the Golden Ticket ID in it.
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Yeah knowing facebook I wouldn’t be surprised if they remove all querystring data which is a tad bit stupid considering how important that information is sometimes