Plugged device in grey for "run on "

I made some tests with a MacOS run through vmware and got some steps forward, so I decided to reinstall from scratch both Mac and Phone : I’m now able to build the app in debug mode , get it pushed to the Phone but execution fails as . At first run, I got a warning from Iphone saying the developper was not trusted, so went into pref, device …Etc… and allowed the developper.
I think my problem is solved regarding dev profiles & misc…
Now,
After Build is complete, app is copied to the phone but I get the error " cannot connect to the debugger". @Greg_O In this article iOS app on real iPad can't connect to the debugger - #16 by Greg_O and the one your previously shared, you mentionned that when the app is pushed at first ( or if you delete it completly ), you are prompted to allow connection for local network


is it only for debugging with network or should I get it was well with USB link only ?
If so, then , what else could prevent the connection with the debugger ?
Thanks !