PayPal WebHook verification yielding 400 bad request for some users

I am seeing 400 responses from the paypalrest provider.

In nginx access logs, I see the 400 response returned (I grabbed one of many lines):
173.0.81.140 - - [30/Dec/2024:01:03:28 +0000] "POST /payment_callback.php?_xfProvider=paypalrest HTTP/1.1" 400 182 "-" "PayPal/AUHR-214.0-58712720"

I see the following in Payment Provider Logs in XenForo:
JSON:

array(9) {
  ["id"] => string(38) "WH-6PW022468P4090935-6L406200PXXXXXXXX"
  ["event_version"] => string(3) "1.0"
  ["create_time"] =>...

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