It is very confusing as to why everyone else can not use this feature, but I can?
On the 29th March 2023 I had this reply from Lexus Customer Relations when I asked about the Remote Parking :-
"However, in answer to the questions you specifically raised, I have received the following confirmation from our Product Department:
1) Will Remote Parking via the app will be available? This is to be determined and confirmed closer to the launch date, so for now no."
I assume the 'launch date' refers to when the feature will be available.
I took delivery of my Takumi on the 14th July and did not try the Remote Park until the 20th July, which worked first time and has continued to work everytime. As mine worked, I assumed that the feature had already been launched, and thought nothing more about the Lexus CR response.