bgp multicast address-family with 0 prefixes

Hi guys.. I'm doing this config but I got this issue:

I don't get prefixes from R4 from R6 on multicast address-family.

(R4 and R6 are directly connected, R4 in AS200 and R6 in AS100)

##### R4 ########

Rack1R4#sh run | be router
!
router bgp 200
 bgp log-neighbor-changes
 neighbor 10.0.0.6 remote-as 100
 !
 address-family ipv4
  no synchronization
  no neighbor 10.0.0.6 activate
  no auto-summary
 exit-address-family
 !
 address-family ipv4 multicast
  redistribute eigrp 100
  neighbor 10.0.0.6 activate
  neighbor 10.0.0.6 route-map PREPEND out
  no auto-summary
 exit-address-family
!

Rack1R4#show route-map
route-map PREPEND, permit, sequence 10
  Match clauses:
  Set clauses:
    as-path prepend 200 200 200
  Policy routing matches: 0 packets, 0 bytes

Rack1R4#sh ip bgp summ

Rack1R4#sh ip bgp ipv4 multica summ

Neighbor V AS MsgRcvd MsgSent TblVer InQ OutQ Up/Down
State/PfxRcd
10.0.0.6 4 100 16 21 87 0 0
00:05:28 7

##### R6 ######

Rack1R6#sh run | be router
!
router bgp 100
 bgp log-neighbor-changes
 neighbor 10.0.0.4 remote-as 200
 !
 address-family ipv4
  no synchronization
  no neighbor 10.0.0.4 activate
  no auto-summary
 exit-address-family
 !
 address-family ipv4 multicast
  redistribute ospf 1
  neighbor 10.0.0.4 activate
  neighbor 10.0.0.4 route-map PREPEND out
  no auto-summary
 exit-address-family
!

Rack1R6#show route-map
route-map PREPEND, permit, sequence 10
  Match clauses:
  Set clauses:
    as-path prepend 100 100 100
  Policy routing matches: 0 packets, 0 bytes

Rack1R6#sh ip bgp summ

Rack1R6#sh ip bgp ipv4 multi summ

Neighbor V AS MsgRcvd MsgSent TblVer InQ OutQ Up/Down
State/PfxRcd
10.0.0.4 4 200 5 7 8 0 0
00:01:16 0

###########

as you can see address-family ipv4 is completely OFF. If I configure it I
can see prefixes coming on R4 and even on R6.. therefore it's a problem
that happens only on multicast address-family..

I'm not able to understand why I've 0 prefixes on R6 multicast family :(

Where am I wrong?

thanks in advance for your help as usual guys!

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