Hello! I understand you're trying to enter your card number in Mon espace santé but keep running into a "technical problem, try again later" message even after multiple attempts. Let's see if we can get this sorted out together.

First, can you tell me a bit more? Is the issue happening right when you enter the card number, or at a later step? Also, is your card an older version without a photo? Sometimes that can affect the activation process.

In the meantime, here are a few steps you can try on your iPhone with iOS 18.6.2:

1. Make sure your Mon espace santé app is fully updated from the App Store. An outdated version can cause such errors.
2. Restart your iPhone to clear any temporary glitches.
3. Try entering the card number carefully—if your card is an older one without a photo, try inputting the full number as it appears, not just parts of it.
4. Check your internet connection—switch from Wi-Fi to cellular data or vice versa to see if the problem persists.

If these don’t help, sometimes the platform experiences temporary server issues. Waiting a few hours and trying again can resolve the problem.

If you continue having trouble, you can reach out to their support by calling 3422 (from France) or visiting the official help page at monespacesante.fr/questions-frequentes for more detailed assistance2.

Could you try these steps and let me know how it goes? If the problem remains, we can explore some advanced troubleshooting together.