Simple example of add a list item with person field

[Ofer-Gal]

The example in the documentation https://pnp.github.io/pnpcore/using-the-sdk/listitems-fields.html#user-fields
Adds the "MyField" column to the list and then uses it to add a ListItem.
What about When the person column already exists?
I tried to create a "FieldUserValue" and add the user created with EnsureUserAsync but it returns a REST error.
Why doesn't values.Add("ManagerLookupId", myUser.Id ); or values.Add("ManagerId", myUser.Id ); work ?

Where can I find simple example?

I managed with

 IField managerField = myList.Fields.First(f=> f.InternalName == "Manager");
 values.Add("Manager" , managerField.NewFieldUserValue(myUser));

Is this the simplest way to do it? seems too much 😒🤦‍♂️

[jansenbe]

To correctly handle the "complex" fields we indeed need to have the field information loaded, your sample is OK. https://pnp.github.io/pnpcore/using-the-sdk/listitems-intro.html#reading-list-items describes how to be best ensure all the fields of the list are installed.