Gmail will only alert you to any emails that come into your primary inbox - Anything into any of the tabbed inboxes doesn't get notified unless you go into the app.
There is also a notifications tickbox within settings that must be turned on and you can select a notification tone from there also.
I have no affiliation whatsoever with O2 or any subsidiary companies. Comments posted are entirely of my own opinion. This is not Customer Service so we are unable to help with account specific issues.
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