I'm not sure if farmworld is available in this modpack but if its so, theres problem with the "world". If its not supposed to be available, its available.
Your pictures sort of answer the question. Farmworld shows up because it is part of the MYM plugin for the Obsidian Nether Portal. It comes up as "invalid" when trying to portal to it as it is disabled for the PO2 servers. The closest comparable realm to farmworld is Mining World, which uses another portal frame altogether. Why it shows up as if it can be used is apparently almost a question.
Hey, i'll tag the @Administrator so they can disable the Farmworld from the MyM Portal. There is no farmworld on Island based servers (Agrarian Skies, Project Ozone, SkyFactory, etc)
The farmworld is disabled on all Project Ozone 2 servers which is why you received the invalid world messaged when trying to go to the farmworld. It is included on the portal by default along with other worlds that are disabled. Just because it is there does not mean you can access it. We do thank you for your concerns on this issue but I can assure you that no player is able to access the farmworld on any of the Project Ozone 2 Servers.
