Marc_Laf Jan_Gutjahr
Just in case you still are unsure like I was I found some other documentation where it was explained more clearly where I finally understood...!
Only fail selected blocking apps in technician phase: Use this setting with Windows Autopilot pre-provisioned deployments to control how your required apps are prioritized during the technician flow. This setting is only available if you've added blocking apps and only applies to devices going through pre-provisioning. Your options:
No: An attempt will be made to install the blocking apps. Autopilot deployment will fail if a blocking app fails to install. No attempt is made to install non-blocking apps. When the end user receives the resealed device and signs in for the first time, the ESP will attempt to install the non-blocking apps
Yes: An attempt will be made to install all required apps. Autopilot deployment will fail if a blocking app fails to install. If a non-blocking app that's targeted to the user fails to install, the ESP ignores it and deployment continues as normal. When the end user signs into the resealed device for the first time, the ESP will reattempt to install the apps that it couldn't in the technician phase. This is the default setting for pre-provisioned deployments.