You would know it the key had been repaired as you have to split the two halves on the part with the key button and blade. You may have noticed that the part with the buttons can easily be removed.
Many cars have a service key, i.e a key that will allow opening the car, but.will not allow starting. Could it be that one of your keys is a service key?
I once had this on my old v70 where I lost a key so purchased a new one ( not inexpensive), and have it programmed. I later found my old key but it no longer worked as it appears the ring aerial would now not a crept it. Could something like this have happened?
Best way I guess is to try and get it programmed by your local Volvo garage. If they cannot program then a new key may be the only option.
John l
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