Session cookies not working in production (Next.js + Nest.js + Better Auth)

async function getSession() {
    const cookieStore = await cookies();
    const cookieHeader = cookieStore.toString();

    try {
        const session = await fetch(
            `${process.env.NEXT_PUBLIC_API_URL}/api/auth/get-session`,
            {
                credentials: "include",
                headers: {
                    Cookie: cookieHeader,
                },
                cache: "no-store",
            }
        );

        if (!session.ok) return null;
        return await session.json();
    } catch (error) {
        console.error("Session fetch error:", error);
        return null;
    }
}