That kit ID is from GEDmatch Genesis. Only the kits (from the old GEDmatch) that begin with one letter (i.e. A786215) can be accessed from WikiTree. Just copy the kit ID from the profile and paste it into a one-to-one comparison on GEDmatch Genesis.
Rumor has it, WikiTree and GEDmatch are working on a solution. Hopefully, one day soon we can do the comparisons from WikiTree on all kits.