To find the Build version and Build number for the particular campaign ACC instance
In a new browser tab, we can find the build number by pasting the instance URL appended with /r/test.
For example - https://instancename.campaign.adobe.com/r/test
To get the build version(+build number as well), you have to login into the instance and then navigate to HELP - ABOUT in Menu bar
NOTE - Please check the values for the application server