It seems that MBNA and the wider Lloyds banking group have now started to block curve.
I obviously have already spoken to MBNA and there is no fraud block on the account. And I have plenty of funds available.
I can make transactions on the MBNA card perfectly fine but unable to add it into my curve wallet since upgrading back to metal. 
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No issues for me paying with a Halifax credit card as the underlying card.
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Your lucky. I’ve just rejoined the metal plan and tried to add my MBNA card back in and it won’t work. The support response wasn’t the best.
I did reply and they told me to delete the card and then re-add it in. Highly hilarious considering I cannot add the card in at all what so ever.
I used my MBNA issued card no worries over the last few days, UK and overseas purchases
I can’t even add the card to the app though.
It’s not even a fraud issue, I’m wondering if this is due to new stronger authentication issues and curve with underlying card providers ?
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Do you have online (e-commerce) transactions enabled on your MBNA card? 
Gotten to the bottom of this.
Other half had logged into my app and frozen my card instead of theirs.
I literally didn’t think to check this!
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I was reading this thread beginning to get worried! 
I’m glad to hear you managed to figure out the cause of the declines.
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I just used my MBNA Card on Curve to spend £4800.00 in one go. No problems here.
out of the threads I have ever read from curve summary, this must be the funniest outcome to date
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Haha yep. The joy of working night shifts in icu and lack of communication at home
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