identityprovider.xml

<identityProvider id="Auth0" type="Sitecore.Owin.Authentication.Configuration.DefaultIdentityProvider, Sitecore.Owin.Authentication">
                  <param desc="name">$(id)</param>
                  <param desc="domainManager" type="Sitecore.Abstractions.BaseDomainManager" resolve="true" />
                  <!--This text will be showed for button-->
                  <caption>Log in with Auth0 - Created by Bas</caption>
                  <icon>/sitecore/shell/themes/standard/Images/24x24/bas.png</icon>
                  <!--Domain name which will be added when create a user-->
                  <domain>sitecore</domain>
                  <!--list of identity transfromations which are applied to the provider when a user signin-->
                  <transformations hint="list:AddTransformation">
                    <!--SetIdpClaim transformation-->
                    <transformation name="set idp claim" ref="federatedAuthentication/sharedTransformations/setIdpClaim" />
                    <!--transformation for Auth0 provider-->
                    <transformation name="devRole" type="Sitecore.Owin.Authentication.Services.DefaultTransformation, Sitecore.Owin.Authentication">
                      <sources hint="raw:AddSource">
                        <claim name="idp" value="Auth0" />
                      </sources>
                      <targets hint="raw:AddTarget">
                        <claim name="http://schemas.microsoft.com/ws/2008/06/identity/claims/role" value="Sitecore\Developer" />
                      </targets>
                      <keepSource>true</keepSource>
                    </transformation>
                  </transformations>
                </identityProvider>