Enable push notifications

[rc211e]

We are having some trouble with push notifications and while checking we discovered "Enable push notifications" check box and explanation is missing from Xenforo PWA setup Options on our install. (v2.2.9) (PHP version 7.1.33) not ideal but panel says "You can only enable this option if you are using PHP 7.1 or above"

We have "Your board meets the requirements to be an installable progressive web app." in green

Is there something we need to do to make check box appear?

PS we have...

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Enable push notifications

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