Why doesn't my google+ send notifications to me anymore like it used to

Hello, I'm not an English speaker I hope you understand.

My google+ used to give me notifications on my notification box on Google+ like "gitll107 has replied to your comment: +chikinmogo"
But not anymore ever since I changed my username.
Please help me, I need to see those people who replied to my comments. I don't see any noticstions on my Google+ box anymore. It's empty forever, no matter how much notifications there are.

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