Why does Aux copy tape job have Error Code: [13:187], "Some backup jobs are skipped because they are aged on destination copy or marked do not copy"

I’ve read up a bit and I’m not quite understanding why I’m seeing this error sometimes…

Basically, we have the copies and retention for this policy set up like this:

primary copy → secondary → to-tape

copy: Retention Days,Full Cycles,Archiver Retention Days,Extended Retention (Rule,days,grace days) ,Data Aging

primary:14,1,infinite, n/a, n/a, Enabled

secondary:7,1, infinite, (Monthly Full/60/0), Enabled

to-tape: infinite, infinite, infinite, n/a, Enabled

Note: “to-tape” is a selective copy, “Monthly Fulls” → last full

Note: We do have this setting set to 1: Media management → Data Ageing → “Disable jobs for Auxillary Copy that have met its retention”

Questions:

We are seeing the [13:187] error occur when running “to-tape”. How can it be “skipped because they are aged on destination copy” if the destination copy (tapes) retention is “infinite”?

Additionally, we do not generally manually mark jobs as “do not copy”.  I can sort of see “aged on the source copy” if we were way behind in running “to-tape” and the “(Monthly Full/60/0)” rule expired on the secondary?