You have an on-premises Active Directory Domain Services (AD DS) domain that syncs with an Azure Active Directory (Azure AD) tenant by using password hash synchronization. You have a Microsoft 365…

Configuring a Conditional Access policy in Azure AD might enforce authentication requirements but does not inherently reduce password prompts; it could potentially introduce additional authentication steps like multi-factor authentication, depending on the policy.

Creating an autodiscover record in the DNS zone is primarily relevant for configuring email clients to automatically find Exchange mailboxes, and it does not address the broader issue of single sign-on for all Microsoft 365 and Azure services.

Azure AD Seamless Single Sign-On (Seamless SSO) provides a single sign-on experience for users on corporate network-connected, domain-joined devices by automatically signing them in to Azure AD-connected applications, including Microsoft 365 and Azure services. When enabled through Azure AD Connect, Seamless SSO uses Kerberos authentication to allow users to access cloud resources without manually entering their passwords, significantly reducing prompts for password entry.

Configuring pass-through authentication (PTA) in Azure AD Connect is an authentication method where users' passwords are validated directly against on-premises Active Directory. While it's an alternative to password hash synchronization, enabling PTA alone does not automatically provide the seamless SSO experience that reduces password prompts on domain-joined devices.