Arlo pro 3

[Baypoint2519]

How do I turn on sound alerts on iPhone 12 when detection of motion

[dcfox1]

Do you have push notifications enabled in Rules for the camera? 

[StephenB]

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@Baypoint2519 wrote:

How do I turn on sound alerts on iPhone 12 when detection of motion

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If you aren't getting any notification at all, then make sure the camera is armed. 

But if you are getting notifications on the phone, but no sound - then look in the main settings for the phone.  You'll find the arlo app is listed (along with all the installed app).  If you select it, you'll see there is a separate setting for sound notifications.  Make sure that is enabled.

Of course if the phone is in silent mode, you won't hear anything, though it should vibrate.