When you try to sign in to your Microsoft account, do you get this message...
Help us to protect your account -
Microsoft has enabled Security Defaults to keep your account secure?
You're not given an option to bypass this.
You have no choice but to enable security for your account as specified by Microsoft.
You may learn more about this...
Let's click on Next and see what happens...
You're asked to install the Microsoft Autheticator app on your phone.
On your phone, go to Google Play Store.
Search for Microsoft Authenticator and install the app.
Open the app after installation.
Sign in to your personal Microsoft account.
Next, verify your identity by choosing any of the options.
Choose Add an account.
After installing the Authenticator app, go back to your Microsoft account log in page.
Follow the instructions.
Next, scan the QR code with the Autheticator app.
Next, approve sign in.
Go to your Microsoft account login and approve.
You're now logged into your Microsoft account.
That is how you secure your Microsoft account using the Authenticator App.
Now go ahead and give the steps a try.