You can resolve problems with Microsoft Authenticator by checking the tips in this article and reviewing some of the known errors.

Get an error message or error code when making a purchase on Xbox? Find out what they mean.

Add your Google account On the Google account security page, go to the Add more second steps to verify it's you section, choose the Set up from the Authenticator app section. On the Get codes from Authenticator page, select either Android or iPhone based on your phone type, and then select Next.

The Microsoft Authenticator app helps you sign into your accounts when you're using two-step verification.

Certificate authority (CA) A certificate authority is an entity similar to a notary public. It issues digital certificates, signs certificates to verify their validity and tracks which certificates have been revoked or have expired. Top of Page Digital signature assurances The following terms and definitions show what assurances are provided by digital signatures. Authenticity The signer is ...

Learn how you can use the free Microsoft Authenticator app to sign in to all your accounts without using a password.

What is a two-step verification? With two-step verification, you'll get a security code to your email, phone, or authenticator app every time you sign in on a device that isn't trusted. Need more help? If you have problems signing in with two-step verification, get more information at Having trouble with Two-factor Authentication. Find out how to Get started with the Microsoft Authenticator ...

When you make your computer a trusted device, you won't need to enter a security code each time you try to access sensitive info, like credit card information associated with your Microsoft account. Setting your computer to be a trusted device can be useful if you use it often, if you have two-step verification enabled, or if you're using the Microsoft Authenticator app to sign in. Here's how ...

About digital signatures and certificates in Office, and buying a digital certificate from a certificate authority or create your own.

Learn how to create and save a passkey to sign in to your Microsoft personal or work/school account and many other websites, apps and services.