Mobile Data Wonky

I am so irritated. I have recently gone from an iPhone to this OnePlus 7 Pro on T-Mobile.
My push notifications only work on wifi....as soon as I switch it to mobile data, I get nothing. Then as soon as I turn on wifi again, they all pop up.
I have looked online in forums and google.
Any suggestions?
I am so irritated. I have recently gone from an iPhone to this OnePlus 7 Pro on T-Mobile.
My push notifications only work on wifi....as soon as I switch it to mobile data, I get nothing....

Mobile Data Wonky

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