Questions & Answers about Byrået finner løsningen.
That is because løsning is not a neuter noun like byrå. It is usually treated as a common gender noun in Bokmål, so its definite singular form takes -en.
- løsning = solution
- løsningen = the solution
So in this sentence:
- byrået = the agency
- løsningen = the solution
The different endings reflect different noun genders.