Hello, I also did passed my assessment for a role under WFP the invitation to take part in the assessment was sent to my email and status in system change. I later wrote the assessment and an email informing me that I had passed assessment came through and status in system changed. After that I was invited for an online panel interview with 3 people, the interview went well. They said they would get back to me in 3 weeks. It has now been 4 months and no news up to now, but the status says "Congratulations, you have passed through to the interview phase".
Did you hear back from them yet?