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You need to access HAL system via "ssh hal.ncsa.illinois.edu" first to initialize your home folder. After your home folder created, you can access HAL-OnDemand without any problem.

I'm a new user and I'm getting "sbatch: error: Batch job submission failed: Invalid account or account/partition combination specified" from s(w)batch/s(w)run/HAL OnDemand

Your account has not been properly initialized. Try logging in and out of hal-login2.ncsa.illinois.edu via SSH a few times. If it isn't working, contact an admin on Slack or send a ticket to help+isl@ncsa.illinois.edu.