Error: Default Membership Provider must be specified

Hello,

Trying to get Episerver to work with OIDC, following the guide at http://world.episerver.com/documentation/developer-guides/CMS/security/integrate-azure-ad-using-openid-connect/

Started working wiht Episerver last week so I should have the latest version. In package.json:

<package id="EPiServer.CMS" version="10.0.1" targetFramework="net461" />

<package id="EPiServer.CMS.Core" version="10.0.1" targetFramework="net461" />

Getting error "Default Membership Provider must be specified" as soon as web.config is changed with

<authenticationmode="None" /><membership><providers><clear/></providers></membership><roleManagerenabled="false"><providers><clear/></providers></roleManager>

Does anyone know how to fix this? Thanks.