Why do I only get email notifications occasionally on my Motorola Moto G4?

The ringtone always works on messages  but only occasionally on emails, This happened on my original phone and now on the replacement, Motorola Support suggested I get from the supplier.  I have done the usual thing of doing factory resets but to no avail. Does anybody have any suggestions please?

When you check the email, do you see all the latest emails you received? Also, which email app are you using?

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