diff --git a/src/Core/GlobalSettings.cs b/src/Core/GlobalSettings.cs
index e676d94205..3c7a0d4d70 100644
--- a/src/Core/GlobalSettings.cs
+++ b/src/Core/GlobalSettings.cs
@@ -179,6 +179,7 @@ namespace Bit.Core
         {
             public string ClientId { get; set; }
             public string Key { get; set; }
+            public string[] ValidationUrls { get; set; }
         }
 
         public class DuoSettings
diff --git a/src/Core/Identity/YubicoOtpTokenProvider.cs b/src/Core/Identity/YubicoOtpTokenProvider.cs
index 4db6b0c505..27a7883401 100644
--- a/src/Core/Identity/YubicoOtpTokenProvider.cs
+++ b/src/Core/Identity/YubicoOtpTokenProvider.cs
@@ -67,6 +67,10 @@ namespace Bit.Core.Identity
             }
 
             var client = new YubicoClient(_globalSettings.Yubico.ClientId, _globalSettings.Yubico.Key);
+            if(_globalSettings.Yubico.ValidationUrls != null && _globalSettings.Yubico.ValidationUrls.Length > 0)
+            {
+                client.SetUrls(_globalSettings.Yubico.ValidationUrls);
+            }
             var response = await client.VerifyAsync(token);
             return response.Status == YubicoResponseStatus.Ok;
         }