HI @Karlinton,
Welcome to the :qiime2: forum!
I'm assuming that you worked on ASVs and then did taxonomic classification? In this case, there isn't a direct one-to-one relationship between the taxonomic assignment or accession and a public database. Multiple ASVs can be mapped to the same taxonomic clade.
There are 2 ways I can come with to approach this. One is to just look up the name in NCBI and get the accession number there. That's probably the easiest solution.
A second option is to filter your representative sequences so you get the ASVs mapped to that taxonomic clade, to tabulate them, and then click the hyperlink to blast them against NCBI. This will give you an ID or set of IDs and you can work from there.
Best,
Justine