I lost my card a while back and ordered a replacement card but ended up finding my card so the replacement didn’t end up being activated. I lost my card while out again but this time haven’t found it can I use my old replacement card or do I have to order a new one
You need to ask Monzo.
In the help section, search “contact”
Does it still give you the option to activate your card? If so it might be ok with that if you’ve still got the replacement.
Worth a shot, if not, reach out.