Hi @timdehaen ,
The Lookup field is actually making this more difficult (you really do not need to use them) - for the sake of the code example below,I will refer to the other list as Responders and the field (I assume a Text field) looked up as Responder (you will need to change to your list/field names).
Your issue is not so much the DefaultSelectedItems which can be
{Value: User().FullName}
but the Update of the Data card which now does not have the Id of the lookup column selected, so you would need
{
Value: ComboBoxName.Selected.Value,
Id:
LookUp(
Responders,
Responder = ComboBoxName.Selected.Value
).ID
}
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