I have a local copy of the blast nr database, which I prepared for a diamond search with prepdb.

After running a search using the "staxids sskingdoms skingdoms sphylums sscinames" options for outfmt 6, I got the following error message:

Error: Taxonomy features are not supported for the BLAST database format.

Running a vanilla blast search against the blast database worked just fine, so I can guarantee that this isn't an issue with the blast database itself not being taxonomically aware.

From what I saw in the diamond documentation, in order to have taxonomy features you need to use --taxonmap when running makedb to create the diamond database, but there is no mention of prepdb. Is there any way to have taxonomically aware searches using a database formatted with prepdb?