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Setting the policy provides access to the listed URLs during authentication (e.g. in the login screen and lock screen), as exceptions to DeviceAuthenticationURLBlocklist. See that policy's description for the format of entries of this list. For example, setting DeviceAuthenticationURLBlocklist to * will block all requests, and you can use this policy to allow access to a limited list of URLs. Use it to open exceptions to certain schemes, subdomains of other domains, ports, or specific paths, using the format specified at ( https://support.google.com/chrome/a?p=url_blocklist_filter_format ). The most specific filter determines if a URL is blocked or allowed. The DeviceAuthenticationURLAllowlist policy takes precedence over DeviceAuthenticationURLBlocklist. This policy is limited to 1,000 entries.
Leaving the policy unset allows no exceptions to DeviceAuthenticationURLBlocklist.