Update Set-CsExternalAccessPolicy.md

Author: krammerliu

teams/teams-ps/teams/Set-CsExternalAccessPolicy.md

@@ -156,7 +156,7 @@ New-CsExternalAccessPolicy -Identity GranularFederationExample -CommunicationWit
 Set-CsTenantFederationConfiguration -CustomizeFederation $true
 ```
 
-In this example, we create an ExternalAccessPolicy named "GranularFederationExample" that allows communication with specific external domains, namely `example1.com` and `example2.com`. The federation policy is set to restrict communication to only these allowed domains. After that, we still have to enable the `CustomizeFederation` setting in the TenantFederationConfiguration to allow the federation settings as defined in the ExternalAccessPolicy to work.
+[Private Preview] In this example, we create an ExternalAccessPolicy named "GranularFederationExample" that allows communication with specific external domains, namely `example1.com` and `example2.com`. The federation policy is set to restrict communication to only these allowed domains.
 
 ## PARAMETERS
 
@@ -200,7 +200,7 @@ Accept wildcard characters: False
 ```
 
 ### -AllowedExternalDomains
-Indicates the domains that are allowed to communicate with the users of this policy. This is referenced only when `CommunicationWithExternalOrgs` is set to be `AllowSpecificExternalDomains`
+[Private Preview] Indicates the domains that are allowed to communicate with the users of this policy. This is referenced only when `CommunicationWithExternalOrgs` is set to be `AllowSpecificExternalDomains`. Only custom policies can change this setting. In Global (default) policy this setting should be default value always and is not allowed to be changed.
 ```yaml
 Type: List
 Parameter Sets: (All)
@@ -215,7 +215,7 @@ Accept wildcard characters: False
 ```
 
 ### -BlockedExternalDomains
-Indicates the domains that are blocked from communicating with the users of this policy. This is referenced only when `CommunicationWithExternalOrgs` is set to be `BlockSpecificExternalDomains`
+[Private Preview] Indicates the domains that are blocked from communicating with the users of this policy. This is referenced only when `CommunicationWithExternalOrgs` is set to be `BlockSpecificExternalDomains`. Only custom policies can change this setting. In Global (default) policy this setting should be default value always and is not allowed to be changed.
 ```yaml
 Type: List
 Parameter Sets: (All)
@@ -230,14 +230,15 @@ Accept wildcard characters: False
 ```
 
 ### -CommunicationWithExternalOrgs
-Indicates how the users get assigned by this policy can communicate with the external orgs. There are 5 options:
+[Private Preview] Indicates how the users get assigned by this policy can communicate with the external orgs. There are 5 options:
 
 - OrganizationDefault: the users of this policy will follow the federation settings defined in TenantFederationConfiguration.
 - AllowAllExternalDomains: the users are open to communicate with all domains.
 - AllowSpecificExternalDomains: the users can only communicate with the users of the domains defined in `AllowedExternalDomains`.
 - BlockSpecificExternalDomains: only users from the domains defined in `BlockedExternalDomains` are blocked from communicating with the users of this policy.
 - BlockAllExternalDomains: the users are not able to communicate with any external domains.
 
+The setting only applies if `EnableAcsFederationAccess` is true. Simiar to `AllowedExternalDomains` and `BlockedExternalDomains`, only custom policies can change this setting. In Global (default) policy this setting should be default value always and is not allowed to be changed.
 ```yaml
 Type: String
 Parameter Sets: (All)