Update Set-CsTenantFederationConfiguration.md

Adding documentation for AllowedTrialTenantDomains.

teams/teams-ps/teams/Set-CsTenantFederationConfiguration.md

@@ -25,6 +25,7 @@ Set-CsTenantFederationConfiguration [-Tenant <Guid>]
  [-AllowFederatedUsers <Boolean>] [-AllowPublicUsers <Boolean>] [-AllowTeamsConsumer <Boolean>] [-AllowTeamsConsumerInbound <Boolean>]
  [-TreatDiscoveredPartnersAsUnverified <Boolean>] [-SharedSipAddressSpace <Boolean>] [-RestrictTeamsConsumerToExternalUserProfiles <Boolean>]
  [-AllowedDomainsAsAList <List>] [-ExternalAccessWithTrialTenants <ExternalAccessWithTrialTenantsType>] [-CustomizeFederation <Boolean>]
+ [-AllowedTrialTenantDomains <List>]
  [[-Identity] <XdsIdentity>] [-Force] [-WhatIf] [-Confirm] [<CommonParameters>]
 ```
 
@@ -182,6 +183,42 @@ Set-CsTenantFederationConfiguration -CustomizeFederation $True
 
 Example 12 shows how you can enable the feature where you can customize your federation in ExternalAccessPolicy.
 
+### -------------------------- Example 13 --------------------------
+```
+$list = New-Object Collections.Generic.List[String]
+$list.add("contoso.com")
+$list.add("fabrikam.com")
+
+Set-CsTenantFederationConfiguration -AllowedTrialTenantDomains $list
+```
+
+Example 13 shows how you can set or replace domains in the Allowed Trial Tenant Domains using a List collection object.
+First, a List collection is created and domains are added to it, then, simply include the `AllowedTrialTenantDomains` parameter and set the parameter value to the List object.
+When this command completes, the Allowed Trial Tenant Domains list will be replaced with those domains.
+
+### -------------------------- Example 14 --------------------------
+```
+$list = New-Object Collections.Generic.List[String]
+$list.add("contoso.com")
+
+Set-CsTenantFederationConfiguration -AllowedTrialTenantDomains @{Add=$list}
+```
+
+Example 14 shows how you can add domains to the existing Allowed Trial Tenant Domains using a List collection object.
+First, a List is created and domains are added to it, then, use the Add method in the `AllowedTrialTenantDomains` parameter to add the domains to the existing allowed domains list.
+When this command completes, the domains in the list will be added to any domains already on the Allowed Trial Tenant Domains list.
+
+### -------------------------- Example 15 --------------------------
+```
+$list = New-Object Collections.Generic.List[String]
+$list.add("contoso.com")
+
+Set-CsTenantFederationConfiguration -AllowedTrialTenantDomains @{Remove=$list}
+```
+
+Example 15 shows how you can remove domains from the existing Allowed Trial Tenant Domains using a List collection object.
+First, a List is created and domains are added to it, then use the Remove method in the `AllowedTrialTenantDomains` parameter to remove the domains from the existing allowed domains list.
+When this command completes, the domains in the list will be removed from the Allowed Trial Tenant Domains list.
 
 ## PARAMETERS
 
@@ -507,6 +544,23 @@ Accept pipeline input: False
 Accept wildcard characters: False
 ```
 
+### -AllowedTrialTenantDomains
+You can provide list of trial tenant domains which are excluded from blocking when `ExternalAccessWithTrialTenants` is set to `Blocked`.
+This allows you to have trial tenant block enabled but still selectively allow communication with some trial tenants.
+
+```yaml
+Type: List
+Parameter Sets: (All)
+Aliases: 
+applicable: Microsoft Teams
+
+Required: False
+Position: Named
+Default value: None
+Accept pipeline input: False
+Accept wildcard characters: False
+```
+
 ### -WhatIf
 Describes what would happen if you executed the command without actually executing the command.