The migration tutorial was written before the convention of appending a 1 to the end of the 1.9 binding names (e.g. mqtt1). The "Text only" section needs to update to include this fact and take it ...

If you are experimenting with the latest openHAB-snapshots, it can be quit annoying to download all nightly-packages, extract them, update all files and addons and copy/replace the configuration files ...