SFP+ to SFP+ no link between RB5009 and CSS610

If I switch either end from an SFP+ cage to normal Ethernet port they work, so I know the cages are working, but when I try to connect them both together I can’t establish any link, never mind a 10g.

Any idea what’s up?

Btw, both cages are Microtik S+RJ10 transceivers.