Common reasons for the discontinuation of iPhone and Mac messages include inconsistent Apple ID, not enabled iCloud information, and network or iCloud storage issues. 1. Make sure that the iPhone and Mac are logged in with the same Apple ID; 2. Check whether the "iCloud Information" is enabled in the iPhone settings → information, and whether the "Enable iCloud Information" is checked in the information application preference settings on the Mac; 3. Confirm that the device is connected to a stable Wi-Fi, go to the Apple official website to check the iCloud service status, and check whether the iCloud storage space is full; 4. Try to turn off the "iCloud Information" function and restart the device and restart it to reset the synchronization. If it still cannot be resolved, consider updating the system or restoring the settings.

If the messages are not synchronized between your iPhone and Mac, it is really troublesome. The most common reason is that the settings are not adjusted correctly, or there is a problem with the synchronization mechanism of iCloud. The good news is that it can be solved in most cases in a few simple steps.

Make sure to log in with the same Apple ID

This is the most basic and easiest point to ignore. Open iPhone Settings → Apple ID and check the currently logged in account; then open System Settings → Apple ID on Mac to confirm that the same account is used on both sides.

• If not, log out of one of the devices and log in to the same account again.
• If you have logged in to the correct account, you can try to log out and log in again. Sometimes you can refresh the synchronization status.

Check whether the "Information" iCloud synchronization is on

Even if you use the same Apple ID, it does not mean that all services are synchronized by default. Manually confirm on both iPhone and Mac:

On iPhone:

1. Settings → Information
2. Confirm that the "iCloud Information" switch is on

On Mac:

1. Open the "Information" app
2. Click "Information" in the menu bar → Preferences → Account
3. Make sure "Enable iCloud Information" is checked

If this option is gray or cannot be checked, it may be because there is a problem with the network connection or your iCloud storage space is full.

You should also take a look at the network and iCloud status

Message synchronization depends on a stable network and normal iCloud services:

• Make sure both iPhone and Mac are connected to Wi-Fi, and cellular data is sometimes unstable
• Go to the system status page of Apple's official website to check if there is any fault in the iCloud information service
• Check if the overall iCloud storage space is full (Settings → Apple ID → iCloud)

If your iCloud space is almost full, consider cleaning photos, backing up or buying larger capacity.

Try restarting the device and resetting synchronization

Sometimes it is necessary to "restart Dafa". First turn off the “iCloud Information” function, wait a few seconds before turning it on again:

1. Settings → Message → Turn off “iCloud Information” on iPhone
2. Wait for a few minutes before turning on the function
3. The information application on the Mac can also be turned off and restarted

Doing so will allow the system to re-pull the message records in the cloud.

Basically these common operations. If it still doesn't work, it may be that an abnormality in the data synchronization of individual devices, which may require more in-depth investigation, such as updating the system version, restoring the settings, etc. However, in most cases, the above steps can be solved.

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