osTicket v1.10 (stable) and Maintenance Release v1.9.15 are now available! Go get it now
[resolved] Unable to bulk import users
It seems to be a known issue in 1.10rc2 but hasent been fixed. https://github.com/osTicket/osTicket/issues/2450
Bulk import doesnt seem to work. i get the exact same error as the screenshot in the link.
to reproduce go to staffpanel -> Users -> Import -> import popup form -> enter data in copy paste section.