IPv6 Address-List not a valid dns name

RouterOS Beginner Basics
1

I am trying to add a IPv6 address block to my Mikrotik router as address-list. I am getting error “Couldn’t add new Firewall IPv6 Address list - 2001:250:2000::/27 is not a valid dns name”.

I am confused with this error. This is a valid IPv6 address block. Why Mikrotik is trying to make it a dns name? How am I suppose to add IPv6 address list?

2

Isn’t it should be 2001:240::/27 ? or your mask is wrong
Tried on my device, added without problems…