Those links all use the ident_taxon_ID_exclusive= parameter (described here), which doesn’t work the way you would like it to if multiple taxa are strung together. It doesn’t seem to work to manually add them to the same link either:
https://www.inaturalist.org/observations?ident_taxon_id_exclusive=259626,318497&ident_taxon_id_exclusive=321705,318497
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