diff --git a/synapse/rest/client/account.py b/synapse/rest/client/account.py
index 4373c73662..232f3a976d 100644
--- a/synapse/rest/client/account.py
+++ b/synapse/rest/client/account.py
@@ -415,6 +415,7 @@ class MsisdnThreepidRequestTokenRestServlet(RestServlet):
request, MsisdnRequestTokenBody
)
msisdn = phone_number_to_msisdn(body.country, body.phone_number)
+ logger.info("Request #%s to verify ownership of %s", body.send_attempt, msisdn)
if not await check_3pid_allowed(self.hs, "msisdn", msisdn):
raise SynapseError(
@@ -444,6 +445,7 @@ class MsisdnThreepidRequestTokenRestServlet(RestServlet):
await self.hs.get_clock().sleep(random.randint(1, 10) / 10)
return 200, {"sid": random_string(16)}
+ logger.info("MSISDN %s is already in use by %s", msisdn, existing_user_id)
raise SynapseError(400, "MSISDN is already in use", Codes.THREEPID_IN_USE)
if not self.hs.config.registration.account_threepid_delegate_msisdn:
@@ -468,6 +470,7 @@ class MsisdnThreepidRequestTokenRestServlet(RestServlet):
threepid_send_requests.labels(type="msisdn", reason="add_threepid").observe(
body.send_attempt
)
+ logger.info("MSISDN %s: got response from identity server: %s", msisdn, ret)
return 200, ret
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