Hi, by default Jaikoz doesnt search Musicbrainz directly it searches our cached version in the albunack database, this gives us a much faster search and protects us from changes and outages on the MusicBrainz server. However this can be a couple of months out of date and since you only recently added this release to MusicBrainz it cannot be found in albunack.
However, Match Songs to Specified Musicbrainz Id will look up from MusicBrainz if it cannot find in Albunack. So I am assuming it did find it but there was some issue that prevented matching your songs to it, but what did it actually say when you entered the Id and pressed OK instead of using search ?
If you could run Advanced:Create Support Files I may be able to see the reason in the logs.
Because it didnt work you then used the Advanced Search to find the release and it couldnt find it. This has exposed a bug and I have raised an issue, this search originally searched the MusicBrainz live database but now it uses Albunack, although the links make it seem it is still searching MusicBrainz
The issue addresses this problem and Im going to change it back so it searches MusicBrainz live which makes more sense for this case.