diff --git a/changelog.d/5638.bugfix b/changelog.d/5638.bugfix
new file mode 100644
index 0000000000000000000000000000000000000000..66781ad9e687b2f6c2afe495478d2c0e92a6925e
--- /dev/null
+++ b/changelog.d/5638.bugfix
@@ -0,0 +1 @@
+Fix requests to the `/store_invite` endpoint of identity servers being sent in the wrong format.