If you override the surefire <argLine>...</argLine> then you need to add the SeaLights parameters inside the override value. See Surefire integration

Do not call the JSON file 'sealights.json' as the agent uses this file name for override options

For troubleshooting purpose,  you can use "buildName":"SL_Timestamp" in your JSON file to have the Sealights Maven plugin generating automatically a time stamp (yyyy.MM.dd-hh.mm format) as a default build name.