If there is a Breakout Box, make sure it is disabled
Search midi and open audio devices. Confirm all Loopback levels are turned up.
In Loopback, note down the Source and Monitor. Delete the profile and then add a new profile with the same Source and Monitor from before. In EBS, under Mic/Aux, choose Loopback as the audio source.
Next, in EBS select Loopback again as the Mic/Aux source.