Initially I set the Volume Retention to 14 days, but I reduced it to 12 days, just to be safe that the tape will definitely get recycled. Thing is, sometimes there are issues that cause the backup not running on time. Backup jobs got pending, and they ran at a later date. Sometimes the jobs got pending for a bit too long and this causes the number of days between the last written date and the incoming backup date to be less than 12 days. When this happens, the incoming backup job will not be able to run because the volume status is 'Used', and it is waiting for me to create a new label.
Just redeuce the volume retention in one day? E. g.: 11 days?
Btw: if you reduce the Volume Retention on a pool, i'm pretty sure you gotta update your álready created volumes with the update command.