Add a switch to override "validating" tenant admin url

Author: koskila

documentation/Rename-PnPTenantSite.md

@@ -135,6 +135,20 @@ Accept pipeline input: True
 Accept wildcard characters: False
 ```
 
+### -SuppressAdminUrlValidation
+Suppress validating the Tenant Admin URL. Useful if your tenant has a vanity domain or an otherwise non-standard admin site address.
+
+```yaml
+Type: SwitchParameter
+Parameter Sets: (All)
+
+Required: False
+Position: Named
+Default value: None
+Accept pipeline input: True
+Accept wildcard characters: False
+```
+
 ### -Wait
 Wait till the renaming of the new site collection is successful. If not specified, a job will be created which you can use to check for its status.
 

src/Commands/Admin/RenameTenantSite.cs

@@ -37,6 +37,9 @@ public class RenameTenantSite : PnPAdminCmdlet
         [Parameter(Mandatory = false)]
         public SwitchParameter SuppressBcsCheck { get; set; }
 
+        [Parameter(Mandatory = false)]
+        public SwitchParameter SuppressAdminUrlValidation { get; set; };
+
         [Parameter(Mandatory = false)]
         public SwitchParameter Wait { get; set; }
 
@@ -68,7 +71,11 @@ protected override void ExecuteCmdlet()
                 OperationId = Guid.Empty
             };
 
-            var tenantUrl = UrlUtilities.GetTenantAdministrationUrl(AdminContext.Url);
+            var tenantUrl = AdminContext.Url;
+            if (!SuppressAdminUrlValidation)
+            {
+                tenantUrl = UrlUtilities.GetTenantAdministrationUrl(AdminContext.Url);
+            }
 
             var results = Utilities.REST.RestHelper.PostAsync<SPOSiteRenameJob>(HttpClient, $"{tenantUrl.TrimEnd('/')}/_api/SiteRenameJobs?api-version=1.4.7", AdminContext, body, false).GetAwaiter().GetResult();
             if (!Wait.IsPresent)