Hi,
Firstly the route learned through IBGP must be active in order to be advertised through EBGP.
Secondly you must take into consideration that by default Junos does not advertise routes back to any EBGP peers that are in the same AS as the originating peer, regardless of the routing instance.
There is a solution to overcome this behavior which is to use the keyword advertise-peer-as.
In any case, use the following command in order to check which routers are being advertised:
show route advertising-protocol bgp <neighbor-ip-address>
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