Waitlist OAuth misconfiguration #7

I've been trying to sign up for the Slices waitlist for some time, but I keep running into issues with the OAuth - despite other atproto OAuth connections like Tangled and pdsls working just fine, the Slices waitlist OAuth keeps erroring on me. It's giving the invalid_client_metadata error that folks have said to update your PDS for, but my PDS is now on 0.4.182 and still runs into it.

OAuth error trace paste My pdsls

Is there some extra configuration on the PDS side that Slices specifically requires or is this with Slices' OAuth flow? I've not been having much luck trying to determine it myself, sadly...