Here is the steps for default login:

To make Google Credential Provider the default login method for Windows, you can follow these steps:

Install Google Credential Provider for Windows (GCPW). You can download the installation file from the Google Admin console.
Configure GCPW settings. You can do this in the Google Admin console or by using the GCPW command-line tool.
Set GCPW as the default login method. You can do this in the Windows Local Group Policy Editor or by using the GCPW command-line tool.
To set GCPW as the default login method in the Windows Local Group Policy Editor:

Open the Group Policy Editor.
Navigate to Computer Configuration > Windows Settings > Security Settings > Local Policies > Security Options.
Double-click the Interactive logon: Default user name policy.
In the Interactive logon: Default user name dialog box, type gcpw in the Default user name box.
Click OK.
To set GCPW as the default login method using the GCPW command-line tool:

Open a command prompt window.
Run the following command:
gcpw settings --default-login-method gcpw
Once you have set GCPW as the default login method, users will be able to sign in to Windows using their Google Account credentials.

Note: If you are using a managed domain, your Google Workspace administrator may need to enable GCPW for your domain before you can use it.

Here are some additional things to keep in mind:

If you are using a personal Google Account, you can still use GCPW to sign in to Windows, but you will need to manually configure it.
If you are using a work or school Google Account, your administrator may have configured GCPW settings for you. In this case, you will not need to manually configure GCPW.
If you are using a domain-joined computer, your administrator may have configured GCPW to automatically associate your Windows profile with your Google Account. In this case, you will not need to manually associate your profile.
If you have any questions or problems, please contact your Google Workspace administrator.