The US' National Labor Relations Board (NLRB) has once again shot down Activision Blizzard's attempt to have the entire Blizzard Albany studio vote on unionisation rather than just its quality assurance team.

As reported by GI.biz, the Call of Duty giant initially tried to pursue this line of reasoning earlier this year though this was rejected in October. The following month, it filed an appeal as well as attempted to stop votes cast by the QA team from being counted.

Blizzard Albany's votes were initially set to be counted in November but it's currently unclear when this will take place now. 

Activision Blizzard tried to have the entire studio vote when Raven Software's quality assurance staff were trying to form a union earlier this year.

"The testers have a separate department and separate supervision; perform a distinct function, utilising distinct skills; and have notably lower wages than the excluded employees," the NLRB said.

An Activision Blizzard rep added: "We still believe our entire Albany team should have the right to vote. This is about fundamental fairness for every member of the team, given the close, collaborative way that Blizzard Albany operates, and ensuring that every employee has the right to choose."