OWA is currently broken in dev. I'll push up the fix whenever codeberg comes back from its present zombie state. If you're impatient,
diff --git a/Code/Module/Owa.php b/Code/Module/Owa.php
index 0fcd29990..33f11a090 100644
--- a/Code/Module/Owa.php
+++ b/Code/Module/Owa.php
@@ -3,6 +3,7 @@
namespace Code\Module;
use Code\Web\HTTPSig;
+use Code\Web\HTTPHeaders;
use Code\Lib\Verify;
use Code\Web\Controller;