Save failed: user with the same identity already exists -- Making a user manually

    if (!user) {
        // Create a new user if they don't exist
        user = await context.entities.User.create({
            data: {
                email: invitation.invitedUserEmail,
                firstName,
                lastName,
            },
        });
    } else {
        // Update existing user
        user = await context.entities.User.update({
            where: { id: user.id },
            data: { firstName, lastName },
        });
    }

    return user;