Error while attempting to switch from default to standard GCP project in Apps Script

[AlexMGT]

Hello,

In order to use Apps Script API, I want my script to be linked to my GCP project instead of default GCP project, but when I put my GCP project number: I have the following message appear : 

You cannot switch to a Cloud Platform project in an Apps Script-managed folder.

Why can't I switch GCP project in Apps Script?

I also tried the steps describe here : https://stackoverflow.com/questions/58918691/cannot-switch-my-google-script-to-a-new-cloud-platform-...

It's mentionned that moving the project into a "normal" folder should solve the issue but I have no clue how to do that.

Any help appreciated, ty !

[OlafH · Accepted solution]

Here is the article that explains all the steps

https://developers.google.com/apps-script/guides/cloud-platform-projects

Did you create a blank new project in your organisation? 

If your created it in the managed folder, here is how to move it 

https://developers.google.com/apps-script/guides/cloud-platform-projects#get_a_list_of_apps_script_g...

Hope that helps