Changes on phone no longer made on computer

I recently replaced my dying Nokia Lumia 735 with a Microsoft Lumia 640. The transfer went for the most part without any glitch. However I have noticed that changes made to Contact details on the phone are no longer being made Contacts on my computer (which is what I am used to). All my email accounts are running as they should be and syncing as they should. I am wondering where I should go to rectify this situation? BW

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