When trying to upload a new SEP License for the Threat Attack Analysis feature on the Symantec Endpoint Detection and Response appliance, you see the error "Failed to upload license". You will also be unable to remove the old/expired SEP license.
This issue is resolved in software release SEDR 4.3.
As a workaround, you can also upload the SEDR product license again or toggle the "Use United Kingdom regional instance only." check box under Global Settings to resolve this.