Yes for the travel eSIM line. Many phones need Data Roaming enabled on the ByeRoaming line so it can attach to partner networks abroad. Turn roaming on for the travel eSIM only — keep Data Roaming off on your home SIM to avoid surprise home-carrier roaming charges.
iPhone: Settings → Cellular → [Travel eSIM] → Data Roaming → On.
Android: Settings → Mobile network / SIM → [Travel eSIM] → Roaming → On.
This is one of the most common fixes when an eSIM is installed but shows no internet. Also confirm the travel line is selected for Cellular Data: How do I switch to my travel eSIM for data?.