I’m a French citizen and I couldn’t use my ID card because of the expiry date.
Since January 2014, french ID card validity is extended from 10 years to 15 years even to already delivered ID cards (without needing to redeliver them). Because of that some cards seem to be expired but are still valid.
As for me the card was delivered in 2007/04/18 and is marked valid until 2017/04/17 but because of the new law, it is truly valid until 2022/04/17 even if it is written otherwise in the card.
Luckily I also have a driving licence so I could register myself with it, but it could be an issue for persons not having a driving licence. French government refuse to submit new ID cards for persons in my situation. I have to wait until 2022 to be allowed to make a new ID card.
Here is a link from the french governement that explain this situation:
It os written in french and english. It is made for borders and foreign organisations.
It could be nice to include this validity extension in the current process to allow people to register having only this kind of document.