Hi there
Please try this
Verify Apple Account: Open Settings on your iPhone, iPad Pro, and Mac mini. Confirm that the exact same Apple Account name and email are used on every device.
Check iCloud Toggles:
- On iPad Pro: Go to Settings > tap your name > iCloud > See All under "Save to iCloud", and make sure Contacts is turned on.
- On Mac mini: Go to System Settings > click your name (Apple ID) > iCloud, and make sure Contactsis enabled.
Confirm Web Status: Log into iCloud using a web browser to check if your contacts appear there. If they do not show online, your iPhone is not successfully uploading them to the cloud.