How to disable Microsoft Defender sign-in prompt.

We're using the default Microsoft Defender in Win 11 Pro on workstations on a domain network. On this network, access to things like OneDrive are just flat out not allowed for security reasons. User's can log in to things like the MS Store, Google accounts, etc. Every time a user logs on using their domain credentials they get a popup from the Microsoft Defender icon in the systray informing them they need to sign in for "best protection". Since they're not permitted to use "any" remote sites for things like data storage there is no need for them to sign in to "ANYTHING" remote. Presently the buttons present on the popup are "Sign In" and "Dismiss".  Per a GPO setup they flat out can't sign in even if they tried. But is there a way in GPO to completely eliminate this popup appearing? I've looked in GPO settings for Defender for both computer and user, but there's nothing that jumps out at me to indicate I can do this without totally and completely disabling Microsoft Defender entirely. TIA.
 - Carl