There are usually daily a Nighttrain from Stockholm directly to Kiruna and further to Narvik ontop you have a daytrain from Lulea - Boden to Kiruna dpature from  boden at 10am connection on the Stockholm - Lulea Nighttrain and i can still find them in the timetable even for November and till early december the anual timetable change :)

Due the pandemic the timetable can still be affected for example the train ends currently in Abisko (far behind Kiruna) no need to worry :)

depature from Stockholm is at 17.06 on weekends and 17.23 during the week arrival 09.11 in Kiruna :)  Changes due works still possible )

As far as I know, it runs daily. Please check on sj.se. The Interrail app is not reliable enough for planning.

There might be engineering works because of which the timetable hasn't been fixed yet.