@Matt Geiger, Thanks for posting in Q&A. After researching, I find the FQBN is with the following format. And I don't find the command to get the information directly. It seems you need to get the information separately to get the FQBN.
To configure the Firewall Rule, I suggest use PackageFamilyName to configure the Firewall rule which can get from the following command directly:
Example:
get-apppackage -name "app name" | fl name, PackageFamilyName
Hope the above information can help.
If the answer is helpful, please click "Accept Answer" and kindly upvote it. If you have extra questions about this answer, please click "Comment".
Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.