Issue with Better-Auth Email Verification

// auth.js config
user: {
    changeEmail: {
        enabled: true,
        sendChangeEmailVerification: async ({ user, newEmail, url, token }) => {
            console.log("sendChangeEmailVerification", user, newEmail, url, token);
            
            await sendEmail({
                from: "my-mail@gmail.com",
                to: newEmail,
                subject: "Vérification d'email",
                text: `Cliquez sur ce lien pour vérifier votre nouvelle adresse email: ${url}`,
            });
        },
    },
    // ...
}

// action.js (server action)
export async function updateUserEmail(email: string) {
    await auth.api.changeEmail({
        body: {
            newEmail: email,
            callbackURL: `/`,
        },
        headers: await headers(),
    })
}