NestJS controller not mapped

Did you put the controller in the module?

@Module({
  controllers: [AuthenticationController],
})
export class AppModule {}

If you have already tried everything else and nothing worked, try deleting the dist folder. That's what worked for me.

Finally found out that some packages from NestJS had version 6 and 7. So they propably interrupted each other. An indicator was this flood of warnings:

After running nest update -f every controller was mapped as it was supposed.