Mac Catalyst Keychain Access Fails with “MissingEntitlement” Error (Works Fine on iOS)

[ramji-uvs3]

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 :

• Platform: Mac Catalyst (.NET 9.0)
• Development: Using .NET MAUI

What I've Tried :
Added the following to my Entitlements.plist:

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

Project Signing Setup (.csproj)

<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 a similar issue when using Keychain or secure storage APIs with .NET MAUI Mac Catalyst apps?

• Are there specific entitlements or signing configurations required for Catalyst beyond the usual iOS setup?
• Does the Mac Catalyst sandbox handle keychain groups differently?

Any insights, sample setups, or references would be greatly appreciated!

[ghost]

Do you have certificates imported in Visual Studio Code, like the Visual Studio do?

[ramji-uvs3]

Yes, I do have a valid Apple Development certificate installed in my Mac Keychain.
However, the certificate I’m currently using was automatically generated when I built the iOS version from Visual Studio on Windows.
For this Mac Catalyst build, I’m using manual provisioning with that same certificate and a manually created provisioning profile.

[ghost]

@ramji-uvs3 does this help - Mac Catalyst Keychain Access Fails with “MissingEntitlement” Error (Works Fine on iOS)? I do not know if it is relevent, but sometimes clean and rebuild does help.