£5 off when spend over £10 (FleBay)

There must be conditions attached or it's expired because when I tried buying ink cartridges for £19.75 it said:

Looks like that's the wrong code. Please double-check and try again.
 
I cant get code as it already used on my account. But thats code was issued to me when i logged into app.
Apon opening app it headlined offer.
I then pasted the code at checkout in vouchers and it removed £5 from Invoice.
Im unsure if there is T&C as first thing i added took £5 off.
 
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