The problem started when configuring ospfv3 on two routers, one ros6 and the other rosv7. Doesn't find its neighbors on IPv6.
R1:
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[GOZFLY@GFL.HEADEND01.RTR01] > /ipv6 address print
Flags: D - DYNAMIC; G, L - LINK-LOCAL
Columns: ADDRESS, INTERFACE, ADVERTISE
# ADDRESS INTERFACE ADVERTISE
;;; Transit-to-Agg01
0 G 2803:f0c0:3003::2/64 vlan3003-transit-to-Agg01 yes
;;; Loopback0
1 G 2803:f0c0:0:100::3/128 Lo0 no
[GOZFLY@GFL.HEADEND01.RTR01] > /routing ospf export
# 2023-07-09 00:02:52 by RouterOS 7.10.1
# software id = JD8R-T50M
#
# model = CCR1009-8G-1S-1S+
# serial number = 70C80419AECB
/routing ospf instance
add disabled=no name=OSPF-v2-IPv4 originate-default=never redistribute="" router-id=100.127.16.3 routing-table=main
add disabled=no name=OSPF-v3-IPv6 originate-default=never redistribute="" router-id=100.127.16.3 routing-table=main version=3
/routing ospf area
add disabled=no instance=OSPF-v2-IPv4 name=backbone
add disabled=no instance=OSPF-v3-IPv6 name=backbone-v3-IPv6
/routing ospf interface-template
add area=backbone comment=Lo0 cost=10 disabled=no interfaces=Lo0 networks=100.127.16.3/32 passive priority=1
add area=backbone comment=V3003-TO-AGG01 cost=10 disabled=no interfaces=vlan3003-transit-to-Agg01 networks=100.126.16.32/29 priority=1 type=ptp use-bfd=yes
add area=backbone comment=V3103-TO-AGG02 cost=20 disabled=no interfaces=vlan3103-transit-to-Agg02 networks=100.126.16.40/29 priority=1 type=ptp use-bfd=yes
add area=backbone-v3-IPv6 comment=Lo0 cost=10 disabled=no instance-id=1 interfaces=Lo0 passive priority=1
add area=backbone-v3-IPv6 comment=V3003-TO-AGG01 cost=10 disabled=no instance-id=1 interfaces=vlan3003-transit-to-Agg01 priority=1 type=ptp use-bfd=no
[GOZFLY@GFL.HEADEND01.RTR01] > /routing ospf neighbor print
Flags: V - virtual; D - dynamic
0 D instance=OSPF-v2-IPv4 area=backbone address=100.126.16.41 router-id=100.127.0.4 state="Full" state-changes=6 adjacency=9h59m10s timeout=33s
1 D instance=OSPF-v2-IPv4 area=backbone address=100.126.16.33 router-id=100.127.0.3 state="Full" state-changes=4 adjacency=9h59m2s timeout=35s
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[GOZFLY@GFL.DC01.AGG01] > /routing ospf-v3 export
# jul/09/2023 00:15:53 by RouterOS 6.48.7
# software id = 7M73-YHHR
#
# model = CCR1036-8G-2S+
# serial number = HE208HBP18G
/routing ospf-v3 instance
set [ find default=yes ] router-id=100.127.0.3
/routing ospf-v3 interface
add area=backbone interface=lo0 network-type=broadcast
add area=backbone interface=vlan3003-transit-to-headend01 network-type=\
point-to-point
[GOZFLY@GFL.DC01.AGG01] > /ipv6 address print
Flags: X - disabled, I - invalid, D - dynamic, G - global, L - link-local
# ADDRESS FROM-POOL INTERFACE ADVERTISE
0 G ;;; Loopback0
2803:f0c0::3/128 lo0 no
1 G ;;; Transit-to-Headend01
2803:f0c0:3003::1/64 vlan3003-transit-to-headend01 yes
[GOZFLY@GFL.DC01.AGG01] > /routing ospf-v3 neighbor print