Fails, does not contain method named AcquireToken

[gdeckler]

Method invocation failed because [Microsoft.IdentityModel.Clients.ActiveDirectory.AuthenticationContext] does not
contain a method named 'AcquireToken'.

I checked and that is the case, https://docs.microsoft.com/en-us/dotnet/api/microsoft.identitymodel.clients.activedirectory.authenticationcontext?view=azure-dotnet

What is the replacement? AcquireTokenAsync, AquireTokenByAuthorizationCode?