diff --git a/src/axolotl/kernels/moe/torch_grouped.py b/src/axolotl/kernels/moe/torch_grouped.py
index 44447d83e..b0f308497 100644
--- a/src/axolotl/kernels/moe/torch_grouped.py
+++ b/src/axolotl/kernels/moe/torch_grouped.py
@@ -56,9 +56,13 @@ def _stack_weights(
 
 def _call_grouped_mm(
     As: List[torch.Tensor], Bs: List[torch.Tensor], dtype: torch.dtype
-) -> Optional[List[torch.Tensor]]:
-    if not As or dtype not in (torch.bfloat16, torch.float16):
-        return [] if not As else None
+) -> Tuple[Optional[List[torch.Tensor]], Optional[str]]:
+    if not As:
+        return [], None
+    if dtype not in (torch.bfloat16, torch.float16):
+        msg = f"unsupported dtype {dtype}"
+        _LOGGER.debug("torch_grouped: %s", msg)
+        return None, msg
 
     try:
         As2 = [a.to(dtype).contiguous().view(a.shape[0], a.shape[1]) for a in As]
@@ -68,7 +72,7 @@ def _call_grouped_mm(
             [a.shape[0] for a in As2], device=device, dtype=torch.int32
         )
         offsets = torch.cumsum(lengths, dim=0)
-        Y_cat = torch.ops.aten._grouped_mm(
+        Y_cat = torch._grouped_mm(
             torch.cat(As2, dim=0), torch.stack(Bs2, dim=0), offsets
         )
         outs: List[torch.Tensor] = []
@@ -76,10 +80,11 @@ def _call_grouped_mm(
         for size in lengths.tolist():
             outs.append(Y_cat[start : start + size])
             start += size
-        return outs
+        return outs, None
     except RuntimeError as err:
-        _LOGGER.warning("torch_grouped: _grouped_mm failed (%s)", err)
-        return None
+        message = f"_grouped_mm failed ({err})"
+        _LOGGER.warning("torch_grouped: %s", message)
+        return None, message
 
 
 def moe_ffn_forward_grouped(
@@ -154,7 +159,7 @@ def moe_ffn_forward_grouped(
     if not as_list:
         return torch.zeros_like(x_flat).view(bsz, seqlen, hdim), router_logits
 
-    up_out = _call_grouped_mm(as_list, bs_list, expert_dtype)
+    up_out, reason = _call_grouped_mm(as_list, bs_list, expert_dtype)
     if up_out is None:
         return None, None
 
@@ -167,7 +172,7 @@ def moe_ffn_forward_grouped(
         down_inputs.append(hidden)
         down_weights.append(w2[i])
 
-    down_out = _call_grouped_mm(down_inputs, down_weights, expert_dtype)
+    down_out, reason = _call_grouped_mm(down_inputs, down_weights, expert_dtype)
     if down_out is None:
         return None, None