diff --git a/dotnet/AipsCore/Application/Models/Whiteboard/Command/BanUserFromWhiteboard/BanUserFromWhiteboardCommand.cs b/dotnet/AipsCore/Application/Models/Whiteboard/Command/BanUserFromWhiteboard/BanUserFromWhiteboardCommand.cs
index e654922..b47059f 100644
--- a/dotnet/AipsCore/Application/Models/Whiteboard/Command/BanUserFromWhiteboard/BanUserFromWhiteboardCommand.cs
+++ b/dotnet/AipsCore/Application/Models/Whiteboard/Command/BanUserFromWhiteboard/BanUserFromWhiteboardCommand.cs
@@ -2,4 +2,4 @@ using AipsCore.Application.Abstract.Command;
 
 namespace AipsCore.Application.Models.Whiteboard.Command.BanUserFromWhiteboard;
 
-public record BanUserFromWhiteboardCommand(string CallerId, string UserId, string WhiteboardId) : ICommand;
\ No newline at end of file
+public record BanUserFromWhiteboardCommand(string UserId, string WhiteboardId) : ICommand;
\ No newline at end of file
diff --git a/dotnet/AipsCore/Application/Models/Whiteboard/Command/BanUserFromWhiteboard/BanUserFromWhiteboardCommandErrors.cs b/dotnet/AipsCore/Application/Models/Whiteboard/Command/BanUserFromWhiteboard/BanUserFromWhiteboardCommandErrors.cs
index b4a2f97..303a529 100644
--- a/dotnet/AipsCore/Application/Models/Whiteboard/Command/BanUserFromWhiteboard/BanUserFromWhiteboardCommandErrors.cs
+++ b/dotnet/AipsCore/Application/Models/Whiteboard/Command/BanUserFromWhiteboard/BanUserFromWhiteboardCommandErrors.cs
@@ -9,10 +9,10 @@ public static class BanUserFromWhiteboardCommandErrors
     public static ValidationError WhiteboardMembershipNotFound(WhiteboardId whiteboardId, UserId userId)
         => new ValidationError(
             Code: "whiteboard_membership_not_found",
-            Message: $"User with id '{userId}' is not a member of whiteboard with id '{whiteboardId}'");
+            Message: $"User with id '{userId.IdValue}' is not a member of whiteboard with id '{whiteboardId.IdValue}'");
     
     public static ValidationError WhiteboardNotFound(WhiteboardId whiteboardId)
         => new ValidationError(
             Code: "whiteboard_not_found",
-            Message: $"Whiteboard with id '{whiteboardId}' not found.");
+            Message: $"Whiteboard with id '{whiteboardId.IdValue}' not found.");
 }
\ No newline at end of file
diff --git a/dotnet/AipsCore/Domain/Common/ValueObjects/DomainId.cs b/dotnet/AipsCore/Domain/Common/ValueObjects/DomainId.cs
index 9f60074..c638377 100644
--- a/dotnet/AipsCore/Domain/Common/ValueObjects/DomainId.cs
+++ b/dotnet/AipsCore/Domain/Common/ValueObjects/DomainId.cs
@@ -22,9 +22,4 @@ public record DomainId : AbstractValueObject
             new MinLengthRule(IdValue, 5)
         ];
     }
-
-    public override string ToString()
-    {
-        return IdValue;
-    }
 }
\ No newline at end of file
diff --git a/dotnet/AipsCore/Infrastructure/Persistence/WhiteboardMembership/WhiteboardMembershipRepository.cs b/dotnet/AipsCore/Infrastructure/Persistence/WhiteboardMembership/WhiteboardMembershipRepository.cs
index 58c7952..52bd6ba 100644
--- a/dotnet/AipsCore/Infrastructure/Persistence/WhiteboardMembership/WhiteboardMembershipRepository.cs
+++ b/dotnet/AipsCore/Infrastructure/Persistence/WhiteboardMembership/WhiteboardMembershipRepository.cs
@@ -57,8 +57,8 @@ public class WhiteboardMembershipRepository
     {
         var whiteboardMembership = await Context.WhiteboardMemberships
             .FirstOrDefaultAsync((entity) =>
-                    entity.WhiteboardId.ToString() == whiteboardId.ToString() &&
-                    entity.UserId.ToString() == userId.ToString(),
+                    entity.WhiteboardId.ToString() == whiteboardId.IdValue &&
+                    entity.UserId.ToString() == userId.IdValue,
                 cancellationToken);
 
         if (whiteboardMembership is null) return null;
diff --git a/dotnet/AipsCore/Infrastructure/UserContext.cs b/dotnet/AipsCore/Infrastructure/UserContext.cs
index 8e8ade9..41bc36e 100644
--- a/dotnet/AipsCore/Infrastructure/UserContext.cs
+++ b/dotnet/AipsCore/Infrastructure/UserContext.cs
@@ -7,7 +7,7 @@ public class UserContext : IUserContext
 {
     public UserId GetCurrentUserId()
     {
-        return new UserId(new Guid("156b58b0-d0f1-4498-b2b6-afa536b68b1a").ToString());
+        return new UserId(new Guid("52a1810c-802f-48b0-a74c-7b517807e392").ToString());
     }
 }