Updated names.

src/Core/AdminConsole/OrganizationFeatures/OrganizationUsers/InviteUsers/Validation/InviteOrganizationUserValidator.cs

@@ -82,7 +82,7 @@ public class InviteUsersValidator(
     }
 
     public static ValidationResult<IGlobalSettings> ValidateEnvironment(IGlobalSettings globalSettings, Valid<PasswordManagerSubscriptionUpdate> subscriptionUpdate) =>
-        globalSettings.SelfHosted && subscriptionUpdate?.Value.AdditionalSeats > 0
+        globalSettings.SelfHosted && subscriptionUpdate?.Value.SeatsRequiredToAdd > 0
             ? new Invalid<IGlobalSettings>(new CannotAutoScaleOnSelfHostError(globalSettings))
             : new Valid<IGlobalSettings>(globalSettings);
 }

src/Core/AdminConsole/OrganizationFeatures/OrganizationUsers/InviteUsers/Validation/PasswordManager/PasswordManagerInviteUserValidator.cs

@@ -16,7 +16,7 @@ public static class PasswordManagerInviteUserValidator
             return new Valid<PasswordManagerSubscriptionUpdate>(subscriptionUpdate);
         }
 
-        if (subscriptionUpdate.AdditionalSeats == 0)
+        if (subscriptionUpdate.NewUsersToAdd == 0)
         {
             return new Valid<PasswordManagerSubscriptionUpdate>(subscriptionUpdate);
         }
@@ -35,7 +35,7 @@ public static class PasswordManagerInviteUserValidator
         }
 
         // Apparently MaxAdditionalSeats is never set. Can probably be removed.
-        if (subscriptionUpdate.AdditionalSeats > subscriptionUpdate.PasswordManagerPlan.MaxAdditionalSeats)
+        if (subscriptionUpdate.NewUsersToAdd > subscriptionUpdate.PasswordManagerPlan.MaxAdditionalSeats)
         {
             return new Invalid<PasswordManagerSubscriptionUpdate>(
                 new PasswordManagerPlanOnlyAllowsMaxAdditionalSeatsError(subscriptionUpdate));

src/Core/AdminConsole/OrganizationFeatures/OrganizationUsers/InviteUsers/Validation/PasswordManager/PasswordManagerSubscriptionUpdate.cs

@@ -7,22 +7,45 @@ namespace Bit.Core.AdminConsole.OrganizationFeatures.OrganizationUsers.InviteUse
 public class PasswordManagerSubscriptionUpdate
 {
     /// <summary>
-    /// Seats the organization has
+    /// Seats the organization is currently paying for
     /// </summary>
     public int? Seats { get; }
 
+    /// <summary>
+    /// Max number of seats that the organization can have
+    /// </summary>
     public int? MaxAutoScaleSeats { get; }
 
+    /// <summary>
+    /// Seats currently occupied by current users
+    /// </summary>
     public int OccupiedSeats { get; }
 
-    public int AdditionalSeats { get; }
+    /// <summary>
+    /// Users to add to the organization seats
+    /// </summary>
+    public int NewUsersToAdd { get; }
 
+    /// <summary>
+    /// Number of seats available for users
+    /// </summary>
     public int? AvailableSeats => Seats - OccupiedSeats;
 
-    public int SeatsRequiredToAdd => AdditionalSeats - AvailableSeats ?? 0;
+    /// <summary>
+    /// Number of seats to scale the organization to.
+    ///
+    /// If Organization has no seat limit (Seats is null), then there are no new seats to add.
+    /// </summary>
+    public int SeatsRequiredToAdd => AvailableSeats.HasValue ? Math.Max(NewUsersToAdd - AvailableSeats.Value, 0) : 0;
 
+    /// <summary>
+    /// New total of seats for the organization
+    /// </summary>
     public int? UpdatedSeatTotal => Seats + SeatsRequiredToAdd;
 
+    /// <summary>
+    /// If the new seat total is equal to the organization's auto-scale seat count
+    /// </summary>
     public bool MaxSeatsReached => UpdatedSeatTotal.HasValue && MaxAutoScaleSeats.HasValue && UpdatedSeatTotal.Value == MaxAutoScaleSeats.Value;
 
     public Plan.PasswordManagerPlanFeatures PasswordManagerPlan { get; }
@@ -30,22 +53,22 @@ public class PasswordManagerSubscriptionUpdate
     private PasswordManagerSubscriptionUpdate(int? organizationSeats,
         int? organizationAutoScaleSeatLimit,
         int currentSeats,
-        int seatsToAdd,
+        int newUsersToAdd,
         Plan.PasswordManagerPlanFeatures plan)
     {
         Seats = organizationSeats;
         MaxAutoScaleSeats = organizationAutoScaleSeatLimit;
         OccupiedSeats = currentSeats;
-        AdditionalSeats = seatsToAdd;
+        NewUsersToAdd = newUsersToAdd;
         PasswordManagerPlan = plan;
     }
 
-    public PasswordManagerSubscriptionUpdate(InviteOrganization inviteOrganization, int occupiedSeats, int seatsToAdd) :
+    public PasswordManagerSubscriptionUpdate(InviteOrganization inviteOrganization, int occupiedSeats, int newUsersToAdd) :
         this(
             organizationSeats: inviteOrganization.Seats,
             organizationAutoScaleSeatLimit: inviteOrganization.MaxAutoScaleSeats,
             currentSeats: occupiedSeats,
-            seatsToAdd: seatsToAdd,
+            newUsersToAdd: newUsersToAdd,
             plan: inviteOrganization.Plan.PasswordManager)
     { }
 
@@ -54,7 +77,7 @@ public class PasswordManagerSubscriptionUpdate
             organizationSeats: validationRequest.InviteOrganization.Seats,
             organizationAutoScaleSeatLimit: validationRequest.InviteOrganization.MaxAutoScaleSeats,
             currentSeats: validationRequest.OccupiedPmSeats,
-            seatsToAdd: validationRequest.Invites.Length,
+            newUsersToAdd: validationRequest.Invites.Length,
             plan: validationRequest.InviteOrganization.Plan.PasswordManager)
     { }
 }