why is my MacBook not syncing with my iphone

Ok, thanks for verifying that. This rules out anything with your Apple ID itself.

If you log into both of these devices with this same ID, then any iCloud information (Calendar, Contacts, Reminders, etc.) would be synced between these devices.

The issue may be a configuration setting on either device. To double-check, try the following:

On your MacBook:

1. System Preferences > Apple ID
2. Verify the following are checked: iCloud Drive, iCloud Mail, Contacts, Calendars, Reminders, etc. Of course, only the items you want synced should be checked.

On your iPhone:

1. Tap on Settings > Apple ID > iCloud
2. Verify the following are enabled: (same as what is checked on your MacBook)

Can you successfully log into the following Apple site with the Apple ID that you use on both of these devices?

• https://appleid.apple.com/#!&page=signin

By syncing are you referring to your iCloud information for both of these devices? If so, do you log into both with the same Apple ID?