Watch Dogs 2 will launch without a multiplayer mode. It doesn’t work and causes issues.
According to Ubisoft, they encountered problems with the “Seamless Multiplayer” feature during the prelaunch phase of Watch Dogs 2. This caused lags and crashed the game occasionally.
To solve the problem and ensure players can enjoy Watch Dogs 2, they decided to temporarily disable this multiplayer feature. Ubisoft will wait to activate the Seamless Multiplayer until the issues are resolved.

They promise that this will not hinder the core gameplay. Players can still enjoy Watch Dogs 2 in single-player mode without any limitations, and the coop mode is still functional.
However, the Bounty Hunter mode and other activities – they will not function. They thank the fans for their patience.