Computer Configuration > Administrative Templates > Microsoft Edge > Identity and sign-in
Both
HKLM\Software\Policies\Microsoft\Edge
Configure this policy to decide whether only on-premises accounts are enabled for implicit sign-in. If you enable this policy, only on-premises accounts will be enabled for implicit sign-in. Microsoft Edge won't attempt to implicitly sign in to MSA or AAD accounts. Upgrade from on-premises accounts to AAD accounts will be stopped as well. If you disable or don't configure this policy, all accounts will be enabled for implicit sign-in. This policy will only take effect when policy 'ConfigureOnPremisesAccountAutoSignIn' (Configure automatic sign in with an Active Directory domain account when there is no Azure AD domain account) is enabled and set to 'SignInAndMakeDomainAccountNonRemovable'.