I set up my Actions on Google project with account linking enabled and the Implicit flow, it's working fine. However, when I try to select "Add quick account linking", after I save and click "Test Draft", it goes to the simulator page with an error message "Failed to enable simulator".
The error happens whether I select "Account creation", "Auto Google Sign-in" or both. I've filled the fields "GSI Client ID", "Token URL" and "Learn More URL" with proper values.
I can see under the hood that a POST query is made to https://console.actions.google.com/u/0/m/actions/agents/draft/createlocalizeduserpreview and returns a 500 error with "status":13. When I unselect "Add quick account linking", the same query succeeds and no error is displayed.
Did anyone get this to work?