Try to travel to Norway and talk to the ex king then back to randvi. She should say Sigurd want to talk to you and that will start his quests.
(Attention for spoilers) Guys, did you complete Sigurd quests first? You have to complete those ones (fake Valhalla), kill Basim and become new jarl. After that, speak to Ranvi and Hytham will appear outside long house.
@arcanapunk I reloaded an autosave before that hideout. I killed the Goliath and all solved.