I enter the command as follow:

time parallel -j 2 \
  "kraken2 --db ${db}/kraken2 --paired temp/qc/{1}_1_kneaddata_paired*.fastq \
  --threads 3 --use-names --use-mpa-style --report-zero-counts \
  --report temp/kraken2/{1}_report \
  --output temp/kraken2/{1}_output" \
  ::: `tail -n+2 result/metadata.tsv | cut -f 1`

the output only include *_output files and not *_report files, I don't know why , anyone helps? Thanks