Merge pull request MicrosoftDocs#12844 from puneethmeister/patch-2

Update New-ProtectionAlert.md

Author: chrisda

exchange/exchange-ps/exchange/New-ProtectionAlert.md

@@ -186,6 +186,8 @@ The AlertBy parameter specifies the scope for aggregated alert policies. Valid v
 
 You can't use this parameter when the AggregationType parameter value is None (alerts are triggered for every occurrence of the activity).
 
+**Note**: This parameter is required to show entities in alerts. Without it, alerts trigger without showing entities. We strongly recommend specifying a value for this parameter.
+
 ```yaml
 Type: MultiValuedProperty
 Parameter Sets: (All)

exchange/exchange-ps/exchange/Set-ProtectionAlert.md

@@ -121,6 +121,8 @@ The AlertBy parameter specifies the scope for aggregated alert policies. Valid v
 
 You can't use this parameter when the AggregationType parameter value is None (alerts are triggered for every occurrence of the activity).
 
+**Note**: This parameter is required to show entities in alerts. Without it, alerts trigger without showing entities. We strongly recommend specifying a value for this parameter.
+
 ```yaml
 Type: MultiValuedProperty
 Parameter Sets: (All)