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-rw-r--r--changelog.d/12520.bugfix1
-rw-r--r--synapse/appservice/__init__.py2
-rw-r--r--synapse/appservice/api.py2
3 files changed, 3 insertions, 2 deletions
diff --git a/changelog.d/12520.bugfix b/changelog.d/12520.bugfix
new file mode 100644
index 0000000000..c73005fde8
--- /dev/null
+++ b/changelog.d/12520.bugfix
@@ -0,0 +1 @@
+Fix a bug in the implementation of MSC3202 where Synapse would use the field name `device_unused_fallback_keys`, rather than `device_unused_fallback_key_types`.
\ No newline at end of file
diff --git a/synapse/appservice/__init__.py b/synapse/appservice/__init__.py
index d23d9221bc..a610fb785d 100644
--- a/synapse/appservice/__init__.py
+++ b/synapse/appservice/__init__.py
@@ -42,7 +42,7 @@ logger = logging.getLogger(__name__)
 #   user ID -> {device ID -> {algorithm -> count}}
 TransactionOneTimeKeyCounts = Dict[str, Dict[str, Dict[str, int]]]
 
-# Type for the `device_unused_fallback_keys` field in an appservice transaction
+# Type for the `device_unused_fallback_key_types` field in an appservice transaction
 #   user ID -> {device ID -> [algorithm]}
 TransactionUnusedFallbackKeys = Dict[str, Dict[str, List[str]]]
 
diff --git a/synapse/appservice/api.py b/synapse/appservice/api.py
index 0cdbb04bfb..adc6b074da 100644
--- a/synapse/appservice/api.py
+++ b/synapse/appservice/api.py
@@ -278,7 +278,7 @@ class ApplicationServiceApi(SimpleHttpClient):
                 ] = one_time_key_counts
             if unused_fallback_keys:
                 body[
-                    "org.matrix.msc3202.device_unused_fallback_keys"
+                    "org.matrix.msc3202.device_unused_fallback_key_types"
                 ] = unused_fallback_keys
             if device_list_summary:
                 body["org.matrix.msc3202.device_lists"] = {