LTM to Junos LACP Query

Looking for a little assistance please, I work with LACP between LTM's and Cisco often, normally this is quite straight forward and I don't experience issues here. I am trying to bring up a LACP bundle between a Juniper stack and a set of LTM's with the below config, two 10gb interfaces in an interface range linked to a vanilla LAG interface.

LTM config is below:

Ideally I'd like both sides Active but have tried various combinations of Active/Passive, periodic slow and fast. No scenario will bring this LAG up, I can't spot what I am doing wrong here, does any one have a working example of LACP to Junos from TMOS they could share?

Link details from TMOS are below advise/help appreciated.