Migration Problem
I just migrated my site using the Migrate Guru plugin. After the migration process was successful, all Fluent Community pages show:
404 Not Found
nginx/1.28.1
Ade Putra Winata not sure if it will solve, but maybe resaving your permalinks settings will help. You can do that under Settings > Permalinks > click save changes at the bottom. Hope it will solve the issue for you!