MissingEntitlement Error with Keychain Access in Mac Catalyst App

My Mac Catalyst app fails with a "MissingEntitlement" error when accessing keychain/secure storage, while the same code works perfectly on iOS. I have tested this extensively on macOS using Visual Studio Code on a MacBook, trying both automatic and manual provisioning approaches - both result in the same MissingEntitlement error during keychain operations.

Error Message: "An error occurred during OTP verification: Error adding record: MissingEntitlement"

Environment :

1. Platform: Mac Catalyst (.NET 9.0)
2. Issue: Keychain access fails on macOS, works on iOS
3. Development: Using .NET MAUI

What I've Tried :

Entitlements Configuration Added keychain-access-groups to Entitlements.plist: xml

<key>keychain-access-groups</key>
<array>
  <string>$(AppIdentifierPrefix)com.example.myapp</string>
</array>

Project Signing Setup (.csproj configuration) :

<PropertyGroup Condition="'$(TargetFramework)'=='net9.0-maccatalyst'">
    <EnableCodeSigning>true</EnableCodeSigning>
    <ProvisioningType>manual</ProvisioningType>
    <DevelopmentTeam>TEAM_ID</DevelopmentTeam>
    <CodesignKey>Apple Development: Name (XXXXXXXXXX)</CodesignKey>
    <ProvisioningProfile>PROVISIONING_PROFILE_UUID</ProvisioningProfile>  <CodesignEntitlements>Platforms/MacCatalyst/Entitlements.plist</CodesignEntitlements>
    <UseHardenedRuntime>true</UseHardenedRuntime>
</PropertyGroup>

Has anyone encountered similar issues with Mac Catalyst keychain access? Any insights on proper entitlement configuration would be greatly appreciated!