SharePoint intranet keeps asking staff to log in again

Start with the Entra sign-in logs for a couple of affected users. They'll tell you whether the prompt is coming from a Conditional Access policy (a sign-in frequency setting does exactly this) or whether the session is just being lost. If it's being lost, the browser is usually the culprit: - browser set to clear cookies when it closes, or people opening the intranet in InPrivate - third-party cookies blocked, which breaks the sign-in in some setups - the "Stay signed in?" prompt turned off in your tenant's branding settings, so nobody gets a persistent session On company machines that are joined to Entra, signing in to Edge with the work profile gives single sign-on and the prompts mostly stop. That's the fix that sticks for most places I've seen.