Fix x and y axis naming in dendrogram trace

Author: Brainor

Diff for: CHANGELOG.md

@@ -2,6 +2,11 @@
 All notable changes to this project will be documented in this file.
 This project adheres to [Semantic Versioning](http://semver.org/).
 
+## [UNRELEASED]
+
+### Fixed
+- Fix issue with creating dendrogram in subplots [[#4411](https://github.com/plotly/plotly.py/pull/4411)],
+
 ## [5.18.0] - 2023-10-25
 
 ### Updated

Diff for: packages/python/plotly/plotly/figure_factory/_dendrogram.py

@@ -387,8 +387,8 @@ def get_dendrogram_traces(
             except ValueError:
                 y_index = ""
 
-            trace["xaxis"] = "x" + x_index
-            trace["yaxis"] = "y" + y_index
+            trace["xaxis"] = f"x{x_index}"
+            trace["yaxis"] = f"y{y_index}"
 
             trace_list.append(trace)