I'm happy to inform you that I have successfully removed your old phone number from your Razer account as an Authenticator. I suggest setting up a new one to secure your Razer account by following the steps below:
1. Log in to your Razer ID account. 2. Select 2-Step Authentication under Security. 3. Enter the code sent to your Razer ID email. 4. Set up your preferred 2-factor authentication method.
Or you may enable an authenticator App for Razer ID. Here is the link as your guide. Feel free to message me if you need further help. All the best!