If your phone is not running Apple iOS or Google’s Android OS e.g. Huawei, it won’t have access to their app stores. You should check the manufacturer or operating system provider app store for an appropriate TOTP authenticator application.
You can also review our other FAQs:
What is Multifactor authentication (MFA) and when will I need to use it?
How do I setup and use MFA?
How do I setup the Microsoft Authenticator MFA method?
How do I get help setting up and using MFA?
What happens if my MFA methods aren’t set up when MFA is enforced?
I’m a guest, how do I see / change what MFA methods I have set up?