diff --git a/mac/Keyman4MacIM/Keyman4MacIM/Privacy/PrivacyConsent.m b/mac/Keyman4MacIM/Keyman4MacIM/Privacy/PrivacyConsent.m
index 057f401cbe4..89e63388523 100644
--- a/mac/Keyman4MacIM/Keyman4MacIM/Privacy/PrivacyConsent.m
+++ b/mac/Keyman4MacIM/Keyman4MacIM/Privacy/PrivacyConsent.m
@@ -1,4 +1,4 @@
-/**
+/*
  * Keyman is copyright (C) SIL International. MIT License.
  * 
  * PrivacyConsent.m
@@ -7,8 +7,8 @@
  * Created by Shawn Schantz on 2022-09-22.
  * 
  * Used to determine if the user has provided consent to the services it needs
- * and, if not, to request that consent. For versions of macOS prior to 10.15,
- * Keyman requires Accessibility access. For 10.15 and later, Keyman requires
+ * and, if not, to request that consent. For versions of macOS prior to 11.0,
+ * Keyman requires Accessibility access. For 11.0 and later, Keyman requires
  * PostEvent access. Both are presented to the user as a need for Accessibility
  * when prompted by the system and are listed under Accessibility in the Privacy
  * tab in System Preferences, Security & Privacy. Both Accessibility and
@@ -16,7 +16,11 @@
  * that access is not explicitly needed as long as one of the others is provided
  * first.
  *
- * Access this functionality through the shared instance. Call
+ * Note that Apple's documentation states that the PostEvent access APIs are
+ * available with macOS 10.15 (Catalina) but testing showed that it was only
+ * available with macOS 11.0 (Big Sur). This is documented with issue #12295.
+ *
+ * To access this functionality, used the shared instance. Call
  * requestPrivacyAccess which will check whether access has been granted. If
  * not, then a dialog will be presented to the user to inform them that
  * Accessibility is required. Dismissing this dialog will trigger the API call
@@ -24,7 +28,7 @@
  * only happen once. If the user was prompted earlier and did not grant access,
  * they can still go to System Preferences and enable it there. So it is useful
  * to prompt with a dialog from Keyman at startup. Without Accessibility, the
- * shift layer and the OSK do not work -- so Keyman is basically useless.
+ * shift layer and the OSK do not work.
  */
 
 #import "PrivacyConsent.h"
@@ -43,7 +47,7 @@ + (PrivacyConsent *)shared
 }
 
 /**
- * For macOS earlier than 10.15: check for Accessibility access.
+ * For macOS earlier than 11.0: check for Accessibility access.
  */
 - (BOOL)checkAccessibility
 {
@@ -66,7 +70,7 @@ - (void)requestPrivacyAccess:(void (^)(void))withCompletionHandler
   BOOL hasAccessibility = NO;
   
   // check if we already have accessibility
-  if (@available(macOS 10.15, *)) {
+  if (@available(macOS 11.0, *)) {
     hasAccessibility = [self checkPostEventAccess];
   } else {
     hasAccessibility = [self checkAccessibility];
@@ -85,7 +89,7 @@ - (void)requestPrivacyAccess:(void (^)(void))withCompletionHandler
 }
 
 /**
- * For macOS earlier than 10.15: request Accessibility access.
+ * For macOS earlier than 11.0: request Accessibility access.
  */
 - (void)requestAccessibility
 {
@@ -113,18 +117,18 @@ - (NSWindowController *)privacyDialog {
  */
 - (void)configureDialogForOsVersion {
   
-  if (@available(macOS 10.15, *)) {
-    [self configureDialogForCatalinaAndLater];
+  if (@available(macOS 11.0, *)) {
+    [self configureDialogForBigSurAndLater];
   } else {
-    [self configureDialogForPreCatalina];
+    [self configureDialogForPreBigSur];
   }
 }
 
 /**
- * Initialize privacy dialog for macOS versions prior to Catalina (10.15).
+ * Initialize privacy dialog for macOS versions prior to Big Sur (11.0).
  * In this case, request Accessibility access, not PostEvent.
  */
-- (void)configureDialogForPreCatalina {
+- (void)configureDialogForPreBigSur {
   void (^consentPrompt)(void) = ^(void) {
     [self requestAccessibility];
     
@@ -136,10 +140,10 @@ - (void)configureDialogForPreCatalina {
 }
 
 /**
- * Initialize privacy dialog for macOS versions of Catalina (10.15) or later.
+ * Initialize privacy dialog for macOS versions of Big Sur (11.0) or later.
  * In this case, request PostEvent access, not Accessibility.
  */
-- (void)configureDialogForCatalinaAndLater {
+- (void)configureDialogForBigSurAndLater {
   void (^consentPrompt)(void) = ^(void) {
     [self requestPostEventAccess];
     
@@ -160,7 +164,7 @@ - (void)showPrivacyDialog {
 
 /**
  * Check whether the user has allowed ListenEvent access.
- * Only available with macOS Catalina (10.15) or later.
+ * Only available with macOS Big Sur (11.0) or later.
  *
  * If user has granted Accessibility or PostEvent access, then
  * ListenEvent access is also granted.
@@ -170,18 +174,18 @@ - (BOOL)checkListenEventAccess
   BOOL hasAccess = NO;
   
   // below checks for ListenEvent access
-  if (@available(macOS 10.15, *)) {
+  if (@available(macOS 11.0, *)) {
     hasAccess = CGPreflightListenEventAccess();
     os_log([KMLogs privacyLog], "CGPreflightListenEventAccess() returned %@", hasAccess ? @"YES" : @"NO");
   } else {
-    os_log([KMLogs privacyLog], "CGPreflightListenEventAccess not available before macOS version 10.15");
+    os_log([KMLogs privacyLog], "CGPreflightListenEventAccess not available before macOS version 11.0");
   }
   return hasAccess;
 }
 
 /**
  * Check whether the user has allowed PostEvent access.
- * Only available with macOS Catalina (10.15) or later.
+ * Only available with macOS Big Sur (11.0) or later.
  *
  * If user has granted Accessibility, then PostEvent access is also granted.
  */
@@ -190,46 +194,46 @@ - (BOOL)checkPostEventAccess
   BOOL hasAccess = NO;
   
   // below checks for PostEvent access
-  if (@available(macOS 10.15, *)) {
+  if (@available(macOS 11.0, *)) {
     hasAccess = CGPreflightPostEventAccess();
     
     os_log([KMLogs privacyLog], "CGPreflightPostEventAccess() returned %@", hasAccess ? @"YES" : @"NO");
   } else {
-    os_log([KMLogs privacyLog], "CGPreflightPostEventAccess not available before macOS version 10.15");
+    os_log([KMLogs privacyLog], "CGPreflightPostEventAccess not available before macOS version 11.0");
   }
   return hasAccess;
 }
 
 /**
  * Request ListenEvent access.
- * Only available with macOS Catalina (10.15) or later.
+ * Only available with macOS Big Sur (11.0) or later.
  */
 - (BOOL)requestListenEventAccess
 {
   BOOL granted = NO;
   
-  if (@available(macOS 10.15, *)) {
+  if (@available(macOS 11.0, *)) {
     granted = CGRequestListenEventAccess();
     os_log([KMLogs privacyLog], "CGRequestListenEventAccess() returned %@", granted ? @"YES" : @"NO");
   } else {
-    os_log([KMLogs privacyLog], "CGRequestListenEventAccess not available before macOS version 10.15");
+    os_log([KMLogs privacyLog], "CGRequestListenEventAccess not available before macOS version 11.0");
   }
   return granted;
 }
 
 /**
  * Request PostEvent access.
- * Only available with macOS Catalina (10.15) or later.
+ * Only available with macOS Big Sur (11.0) or later.
  */
 - (BOOL)requestPostEventAccess
 {
   BOOL granted = NO;
   
-  if (@available(macOS 10.15, *)) {
+  if (@available(macOS 11.0, *)) {
     granted = CGRequestPostEventAccess();
     os_log([KMLogs privacyLog], "CGRequestPostEventAccess() returned %@", granted ? @"YES" : @"NO");
   } else {
-    os_log([KMLogs privacyLog], "CGRequestPostEventAccess not available before macOS version 10.15");
+    os_log([KMLogs privacyLog], "CGRequestPostEventAccess not available before macOS version 11.0");
   }
   return granted;
 }