KeyError: 'expires_in' when processing the webhook from the Webchat of an Azure Bot

[balhissay]

18:39:50 INFO werkzeug 127.0.0.1 - - [17/Aug/2022 18:39:50] "POST /botframework HTTP/1.1" 500 -
18:39:50 ERROR errbot.core_plugins Exception on /botframework [POST]
Traceback (most recent call last):
File "/home/carlosfe/.local/share/virtualenvs/errbot-U5BMEhuZ/lib/python3.8/site-packages/flask/app.py", line 2073, in wsgi_app
response = self.full_dispatch_request()
File "/home/carlosfe/.local/share/virtualenvs/errbot-U5BMEhuZ/lib/python3.8/site-packages/flask/app.py", line 1518, in full_dispatch_request
rv = self.handle_user_exception(e)
File "/home/carlosfe/.local/share/virtualenvs/errbot-U5BMEhuZ/lib/python3.8/site-packages/flask/app.py", line 1516, in full_dispatch_request
rv = self.dispatch_request()
File "/home/carlosfe/.local/share/virtualenvs/errbot-U5BMEhuZ/lib/python3.8/site-packages/flask/app.py", line 1502, in dispatch_request
return self.ensure_sync(self.view_functions[rule.endpoint])(**req.view_args)
File "/home/carlosfe/PYTHON/CHATOPS/backend-plugins/errbot-backend-botframework/botframework.py", line 268, in post_botframework
errbot.send_feedback(msg)
File "/home/carlosfe/PYTHON/CHATOPS/backend-plugins/errbot-backend-botframework/botframework.py", line 232, in send_feedback
self._send_reply(feedback)
File "/home/carlosfe/PYTHON/CHATOPS/backend-plugins/errbot-backend-botframework/botframework.py", line 189, in _send_reply
access_token = self._ensure_token()
File "/home/carlosfe/PYTHON/CHATOPS/backend-plugins/errbot-backend-botframework/botframework.py", line 151, in _ensure_token
self._token = auth(self._appId, self._appPassword)
File "/home/carlosfe/PYTHON/CHATOPS/backend-plugins/errbot-backend-botframework/botframework.py", line 38, in auth
expires_in = r['expires_in']
KeyError: 'expires_in'