diff -r a9682cad0e67 -r 7565298aa197 mod_http_oauth2/mod_http_oauth2.lua
--- a/mod_http_oauth2/mod_http_oauth2.lua	Fri Jul 21 00:29:24 2023 +0200
+++ b/mod_http_oauth2/mod_http_oauth2.lua	Fri Jul 21 00:37:34 2023 +0200
@@ -747,6 +747,12 @@
 	"refresh_token";
 	device_uri;
 })
+if allowed_grant_type_handlers:contains("device_code") then
+	-- expand short form because that URI is long
+	module:log("debug", "Expanding %q to %q in '%s'", "device_code", device_uri, "allowed_oauth2_grant_types");
+	allowed_grant_type_handlers:remove("device_code");
+	allowed_grant_type_handlers:add(device_uri);
+end
 for handler_type in pairs(grant_type_handlers) do
 	if not allowed_grant_type_handlers:contains(handler_type) then
 		module:log("debug", "Grant type %q disabled", handler_type);