set firewall ipv6 output filter default-action accept
set firewall ipv6 output filter rule 100 action drop
set firewall ipv6 output filter rule 100 recent count 10
set firewall ipv6 output filter rule 100 recent time minute

vyos@vyos commit
[ firewall ]
Fail to apply firewall Error found on: firewall ipv6 output filter rule
100         Error message: syntax error, unexpected string, expecting {
[[firewall]] failed
Commit failed