Hello! I understand that you're having trouble renewing your MuseScore Pro+ subscription on your iPhone running iOS 17.6.1, and the payment isn't going through via Apple. Let's work through this together to see what might be causing the issue and how we can fix it.

First, can you tell me:

- Are you seeing any specific error message when the payment fails?
- Have you verified that your Apple ID payment information is up to date and valid?
- Have you tried restarting your phone and attempting the purchase again?

Meanwhile, here is a set of steps tailored for iOS devices that usually help resolve subscription purchase or renewal problems:

1. Check Apple ID Payment Method:
Go to Settings > [Your Name] > Payment & Shipping and make sure your payment method is valid and has no issues. Sometimes expired or declined cards cause the purchase to fail.

2. Sign Out and Sign Back Into Apple ID:
- Go to Settings > [Your Name] and scroll down to sign out.
- After signing out, sign back in with your Apple ID.
This can refresh your Apple account's connection to the App Store.

3. Update MuseScore App:
Make sure you have the latest version of the MuseScore app from the App Store. Updates sometimes fix bugs related to purchases.

4. Restore Purchases in MuseScore App:
Open the MuseScore app, go to the subscription or account settings and tap on "Restore Purchases." This can re-sync your subscription status if payment was successful but not reflected.

5. Check for Apple System Status:
Sometimes Apple's payment system may have outages. Visit Apple's system status page to ensure the App Store and payment services are operational.

6. Try Purchasing on Another Network:
If you are on Wi-Fi, try switching to cellular data or vice versa. Sometimes network restrictions affect payments.

If after these you still cannot renew, it might be a specific issue with the transaction or your account's subscription status on MuseScore’s side, which could require further investigation.

Would you like to proceed through these steps now? Also, do you have any receipts or transaction attempts shown in your Apple purchase history?

Let me know, and we’ll get this sorted for you!