FaceTime Trouble on MacBook Pro

in Genius Bar

I noticed recently my FaceTime and iMessage (and other updates/notifications) don't work while I am on my wifi but they do when I use my phone's hotspot. I have tried signing out of my apple id, restarting my MacBook but nothing has helped. I could really use some help. Although it did work just once a few days back, but I have no idea how that happened.
My MacBook is running on macOS Catalina version 10.15.6 and is a 2017 version. 

Many thanks.

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