From you description it is not quite clear what you are doing and what is happening. “Lookup” will obviously not work well when you have no existing artist and title tags (or the title is just “Track1”).
When you click “Scan” what happens? Does Picard start loading an album in the right pane? If yes, does it give an error or does it just not finish loading?
If “Scan” does not load an album, does at least show the AcoustId in the metadata (see How to determine if Scan function is working)?
If it does show the AcoustId “Scan” is working but the AcoustId is not yet linked to any MusicBrainz recording. In this case you have to fallback to any other method of loading an album into Picard (e.g. using “Lookup” or if this does not work manual search) and assign the tracks. Afterwards you can submit the matches so the AcoustIds get properly linked to the recordings. Just make sure you have selected the proper recording.