Object already owned

[batkaj]

  I have tried the most out of it. Owned doesn't budge.

[MichaelBranscomb]

What collection type are IncludedLayers and ExcludedLayers?

[batkaj]

only feature type.

[batkaj]

[dotMorten_esri]

Is/was the layer already part of a map? It can only be in one layer collection.

If you just need to turn layers on/off like the above screenshot seems to indicate, you can just use the IsVisible property.