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This should be more efficient:
awk -F"[# ]" 'NR==FNR{a[$1]=$1;next}$NF in a {print $1, $2, a[$NF]}' list.txt testfile.txt

Your example said you need $1, $2 from test file and $0 from list file and I have provided the code for the same.

If you want to print $3 as well from test file
awk 'NR==FNR{a[$0]; next} {for(x...

awk 'NR==FNR{a[$0]; next} {for(x in a) {if($0 ~ x) {print $1, $2, x}}}' FS='#' list.txt testfile.txt