Google Identity Services is migrating to FedCM APIs. Follow themigration guideto review potential changes and avoid negative impacts for user sign-in to your website.
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Google One Tap stores user status in theg_statecookie. By default, the
cookie domain is set to the domain of current page.
If One Tap is displayed on the parent domain and subdomains, the state cookie
must be visible across all of your domains. In this case, you need to set the
cookie domain to your parent domain, mainly when you set the cookie from a
subdomain.
You can use thedata-state_cookie_domainconfiguration parameter to change the
state cookie domain. The following code example shows how to set thedata-state_cookie_domainparameter: