Right clicking a spawner with an Alpha Werewolf Spawn Egg changes the spawner to Alpha Werewolves. However, the spawner never spawns them. I have tried varying day/night, light levels, and biomes with no results.

MC Version: 1.16.5
Mod Version: Werewolves-1.16.5-1.8-0.6.0.jar
Mods/Modpack: All The Magic Spell Bound - ATMS (2.2.7)
Mode: Mutiplayer Dedicated Server (found same results in Single Player)

Spawner are not explicitly supported by the Alpha Werewolf spawning algorithmus.

Have you tried it in the Werewolf Heaven biome above ocean level or in the dark under the sky?