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I have, like all other people, not been getting notifications from the calendar app for reminders,but may have found a fix at least it works for me.
I simply changed the colour of the reminder notifications from the blueish purplish colour I had to the tomato colour that's on the top of the colour list and like magic it worked. Now I have tried it three times and everytime I tried it,it gave me a notification both visually and an audio notification.
Don't ask me why but it works, try it out and post your results I'm sure I am not alone to see if it works for others.
I don't think the colours actually matter but changing the colour seems to work good luck guys
PS actually having thought about it the only other thing I did was set a reminder using the Google assistant to see if it did in fact work properly and it did but I think it was the changing colour that got it working again
PS I would love to know either way, eg if it works for you or not ? Either feedback would be nice