diff --git a/CHANGELOG.md b/CHANGELOG.md
index 7fb1662db8..185ed50ad2 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -18,6 +18,7 @@
 
 ### Internals
 * Update TestAppSession to allow scope-based usage for restarting the local app resources. ([PR #7672](https://github.com/realm/realm-core/pull/7672))
+* Added definitions for missing protocol errors reported by the server. ([PR #7982](https://github.com/realm/realm-core/pull/7982))
 
 ----------------------------------------------
 
diff --git a/src/realm/error_codes.cpp b/src/realm/error_codes.cpp
index d137afc28f..b3aa6b64c9 100644
--- a/src/realm/error_codes.cpp
+++ b/src/realm/error_codes.cpp
@@ -393,9 +393,11 @@ static const constexpr MapElem string_to_error_code[] = {
     {"SyncConnectFailed", ErrorCodes::SyncConnectFailed},
     {"SyncConnectTimeout", ErrorCodes::SyncConnectTimeout},
     {"SyncInvalidSchemaChange", ErrorCodes::SyncInvalidSchemaChange},
+    {"SyncLocalClockBeforeEpoch", ErrorCodes::SyncLocalClockBeforeEpoch},
     {"SyncPermissionDenied", ErrorCodes::SyncPermissionDenied},
     {"SyncProtocolInvariantFailed", ErrorCodes::SyncProtocolInvariantFailed},
     {"SyncProtocolNegotiationFailed", ErrorCodes::SyncProtocolNegotiationFailed},
+    {"SyncSchemaMigrationError", ErrorCodes::SyncSchemaMigrationError},
     {"SyncServerPermissionsChanged", ErrorCodes::SyncServerPermissionsChanged},
     {"SyncUserMismatch", ErrorCodes::SyncUserMismatch},
     {"SyncWriteNotAllowed", ErrorCodes::SyncWriteNotAllowed},
@@ -407,6 +409,7 @@ static const constexpr MapElem string_to_error_code[] = {
     {"TwilioError", ErrorCodes::TwilioError},
     {"TypeMismatch", ErrorCodes::TypeMismatch},
     {"UnexpectedPrimaryKey", ErrorCodes::UnexpectedPrimaryKey},
+    // UnknownError intentionally left out of list
     {"UnsupportedFileFormatVersion", ErrorCodes::UnsupportedFileFormatVersion},
     {"UserAlreadyConfirmed", ErrorCodes::UserAlreadyConfirmed},
     {"UserAppDomainMismatch", ErrorCodes::UserAppDomainMismatch},
diff --git a/src/realm/error_codes.h b/src/realm/error_codes.h
index 4b0a85bcd8..e27fe366e6 100644
--- a/src/realm/error_codes.h
+++ b/src/realm/error_codes.h
@@ -266,6 +266,9 @@ typedef enum realm_sync_errno_session {
     RLM_SYNC_ERR_SESSION_REVERT_TO_PBS = 234,
     RLM_SYNC_ERR_SESSION_BAD_SCHEMA_VERSION = 235,
     RLM_SYNC_ERR_SESSION_SCHEMA_VERSION_CHANGED = 236,
+    // Error code 237 is not used by the client
+    // Error code 238 is not used by the sync protocol
+    RLM_SYNC_ERR_SESSION_SCHEMA_VERSION_FORCE_UPGRADE = 239,
     // Error code 299 is reserved as an "unknown session error" in tests
 } realm_sync_errno_session_e;
 
diff --git a/src/realm/sync/protocol.cpp b/src/realm/sync/protocol.cpp
index 525604f785..7803403e86 100644
--- a/src/realm/sync/protocol.cpp
+++ b/src/realm/sync/protocol.cpp
@@ -128,6 +128,9 @@ const char* get_protocol_error_message(int error_code) noexcept
         case ProtocolError::schema_version_changed:
             return "Client opened a session with a new valid schema version - migrating client to use new schema "
                    "version (BIND)";
+        case ProtocolError::schema_version_force_upgrade:
+            return "Server has forcefully bumped client's schema version because it does not support schema "
+                   "versioning";
     }
     return nullptr;
 }
@@ -222,6 +225,8 @@ Status protocol_error_to_status(ProtocolError error_code, std::string_view msg)
             case ProtocolError::bad_schema_version:
                 [[fallthrough]];
             case ProtocolError::schema_version_changed:
+                [[fallthrough]];
+            case ProtocolError::schema_version_force_upgrade:
                 return ErrorCodes::SyncSchemaMigrationError;
 
             case ProtocolError::limits_exceeded:
diff --git a/src/realm/sync/protocol.hpp b/src/realm/sync/protocol.hpp
index eab452bdf2..005a672f6e 100644
--- a/src/realm/sync/protocol.hpp
+++ b/src/realm/sync/protocol.hpp
@@ -425,6 +425,7 @@ enum class ProtocolError {
     revert_to_pbs                = RLM_SYNC_ERR_SESSION_REVERT_TO_PBS,              // Server rolled back to PBS after FLX migration - revert FLX client migration (BIND)
     bad_schema_version           = RLM_SYNC_ERR_SESSION_BAD_SCHEMA_VERSION,         // Client tried to open a session with an invalid schema version (BIND)
     schema_version_changed       = RLM_SYNC_ERR_SESSION_SCHEMA_VERSION_CHANGED,     // Client opened a session with a new valid schema version - migrate client to use new schema version (BIND)
+    schema_version_force_upgrade = RLM_SYNC_ERR_SESSION_SCHEMA_VERSION_FORCE_UPGRADE, // Server has forcefully bumped client's schema version because it does not support schema versioning
 
     // clang-format on
 };