For virtually all Victron GX devices and VEConfigure:
(Yes, just the letter V, capitalized).
While the official password is kept semi-private for safety reasons, it is frequently cited in technical forums and training documentation. Users often reference TPWMBU2A4GCC as the standard password for the grid tab in VEConfigure. Grid code password? - DIY - Victron Community
He remembered a forum post he’d scavenged through two nights ago. Victron didn't use a single universal "backdoor" password for the public for obvious safety reasons. The passwords were typically specific to the distributor or the region, encoded to ensure that only a certified installer—who understood the local regulations—could change the grid standard.