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IPv6 does not work and "no link-local IPv6 address for ens5"

zm flag

When I try to ping6 ipv6.google.com I get ping6: connect: Network is unreachable. When restarting my network interface ens5 it shows a no link-local IPv6 address for ens5 message. I am pretty sure IPv6 is configured correctly on Amazon EC2's side (I followed this guide). Does anybody know why this could be happening? I left a few commands I executed below. Thanks.

root@ip-172-31-40-213:~# ifdown ens5 && ifup ens5
Killed old client process
Internet Systems Consortium DHCP Client 4.4.1
Copyright 2004-2018 Internet Systems Consortium.
All rights reserved.
For info, please visit https://www.isc.org/software/dhcp/

Listening on LPF/ens5/0a:aa:60:52:6c:6c
Sending on   LPF/ens5/0a:aa:60:52:6c:6c
Sending on   Socket/fallback
DHCPRELEASE of 172.31.40.213 on ens5 to 172.31.32.1 port 67
Killed old client process
Internet Systems Consortium DHCP Client 4.4.1
Copyright 2004-2018 Internet Systems Consortium.
All rights reserved.
For info, please visit https://www.isc.org/software/dhcp/

no link-local IPv6 address for ens5

If you think you have received this message due to a bug rather
than a configuration issue please read the section on submitting
bugs on either our web page at www.isc.org or in the README file
before submitting a bug.  These pages explain the proper
process and the information we find helpful for debugging.

exiting.
Internet Systems Consortium DHCP Client 4.4.1
Copyright 2004-2018 Internet Systems Consortium.
All rights reserved.
For info, please visit https://www.isc.org/software/dhcp/

Listening on LPF/ens5/0a:aa:60:52:6c:6c
Sending on   LPF/ens5/0a:aa:60:52:6c:6c
Sending on   Socket/fallback
DHCPDISCOVER on ens5 to 255.255.255.255 port 67 interval 5
DHCPOFFER of 172.31.40.213 from 172.31.32.1
DHCPREQUEST for 172.31.40.213 on ens5 to 255.255.255.255 port 67
DHCPACK of 172.31.40.213 from 172.31.32.1
bound to 172.31.40.213 -- renewal in 1624 seconds.
Internet Systems Consortium DHCP Client 4.4.1
Copyright 2004-2018 Internet Systems Consortium.
All rights reserved.
For info, please visit https://www.isc.org/software/dhcp/

Listening on Socket/ens5
Sending on   Socket/ens5
PRC: Confirming active lease (INIT-REBOOT).

root@ip-172-31-40-213:~# ifconfig
ens5: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 9001
        inet 172.31.40.213  netmask 255.255.240.0  broadcast 172.31.47.255
        inet6 fe80::8aa:60ff:fe52:6c6c  prefixlen 64  scopeid 0x20<link>
        inet6 2600:1f1e:8c9:4c00:1a6e:56e3:12dc:d5c2  prefixlen 128  scopeid 0x0<global>
        ether 0a:aa:60:52:6c:6c  txqueuelen 1000  (Ethernet)
        RX packets 51  bytes 5714 (5.5 KiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 51  bytes 13532 (13.2 KiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

lo: flags=73<UP,LOOPBACK,RUNNING>  mtu 65536
        inet 127.0.0.1  netmask 255.0.0.0
        inet6 ::1  prefixlen 128  scopeid 0x10<host>
        loop  txqueuelen 1000  (Local Loopback)
        RX packets 34  bytes 3308 (3.2 KiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 34  bytes 3308 (3.2 KiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

tun0: flags=4305<UP,POINTOPOINT,RUNNING,NOARP,MULTICAST>  mtu 1500
        inet 10.8.0.1  netmask 255.255.255.0  destination 10.8.0.1
        inet6 fd42:42:42:42::1  prefixlen 112  scopeid 0x0<global>
        inet6 fe80::b25c:3ee4:c340:6665  prefixlen 64  scopeid 0x20<link>
        unspec 00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00  txqueuelen 500  (UNSPEC)
        RX packets 0  bytes 0 (0.0 B)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 26  bytes 1748 (1.7 KiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
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