SMB Server 'folder can't be found'

Hi! A few years ago I connected an SMB server (via Finder> Go> Connect to Server) in order to remotely access my home media server (a Qnap device). It never really worked properly so I simply removed it. However, since deleting the SMB server, deleting the Qnap app and any other reference... Both Macs (new and old, as new is a replica of old via 'Migration Assistant') are still trying to connect to it at start-up.

When I click on Finder> Go> Go to folder, I am being told that 'the folder can't be found'.

I have searched my Mac using finder and I also cannot find any reference to this server, and I cannot delete it as it's not presented to me as a server in finder. Therefore, every time I start-up, I am getting this error several times until I click 'OK'.

If anyone has an idea of how to address this once and for all, it would be GREATLY appreciated. Thanks!