I created a new project in Unreal Engine. The Wwise browser worked in Unreal Engine untill I build my soundbanks in Wwise itself. This made the Wwise browser showcase the message "SoundBank metadata was not found at path specified by the "Root Output Path" settting: [filepath]. This folder should match the "Root Output Path" in the Wwise Project's SoundBanks settings. Ensure the folders match, and that SoundBanks and JSON metadata are generated. Press the "Refresh" button to re-parse the generated metadata.
I have taken the steps provided and also looked online for answers but wasn't able to find answers. The folders match and the generate JSON metadata is switched on.