The problem is that you must use your group account for the -A <account> argument, not your username (e.g. uqepowe3).

You can find the group accounts associated with your username by using the groups command:

$ groups uqepowe3
uqepowe3 : sf-UQ bioinformatics2

Please use the group account corresponding to your departmental/organisational affiliation (e.g. sf-UQ) and not the bioinformatics group (e.g. bioinformatics2).

The correct command should be:

$ qsub -I -l select=1:ncpus=1:mem=5gb:nodetype=medium -l walltime=3:0:0 -A sf-UQ -q interact