Our R&D team suspects that this might be due to the following limitation with Microsoft Windows OShttps://support.microsoft.com/en-in/help/3063910/sso-with-pre-logon-fails-during-user-logon-after-a-restart
For Pulse Credential provider tile to show up on the Windows login screen, Pulse credential provider filter should be notified about OneX credential providers. Pulse relies on Microsoft windows native Pre-Logon Authentication Provider (PLAP) logon filter for this functionality.
Owing to a race condition between the PLAPLogonFilter and the initialization of WiredAutoConfig service or the WLANAutoConfig service ( responsible for Wired & Wireless 802.1x respectively ) while booting up, PLAP logon filter is unable to identify the OneX credential providers properly & Pulse Credential provider is not notified about the same. This eventually results in Pulse Secure not loading the CP tile on Windows login screen.