-Description
Synapse Version v1.12.1 (latest docker image) SSO does not work with keycloak
Here is the error msg:
File "/usr/local/lib/python3.7/site-packages/authlib/jose/rfc7518/_cryptography_backends/_jws.py", line 41, in prepare_key
return RSAKey.import_key(raw_data)
File "/usr/local/lib/python3.7/site-packages/authlib/jose/rfc7518/_cryptography_backends/_keys.py", line 119, in import_key
b'ssh-rsa', options
File "/usr/local/lib/python3.7/site-packages/authlib/jose/rfc7518/_cryptography_backends/_keys.py", line 277, in import_key
cls.check_required_fields(raw)
File "/usr/local/lib/python3.7/site-packages/authlib/jose/rfc7517/models.py", line 120, in check_required_fields
raise ValueError('Missing required field: "{}"'.format(k))
ValueError: Missing required field: "e"

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
File "/usr/local/lib/python3.7/site-packages/synapse/handlers/oidc_handler.py", line 688, in handle_oidc_callback
userinfo = await self._parse_id_token(token, nonce=nonce)
File "/usr/local/lib/python3.7/site-packages/synapse/handlers/oidc_handler.py", line 494, in _parse_id_token
claims_params=claims_params,
File "/usr/local/lib/python3.7/site-packages/authlib/jose/rfc7519/jwt.py", line 98, in decode
data = self._jws.deserialize_compact(s, load_key, decode_payload)
File "/usr/local/lib/python3.7/site-packages/authlib/jose/rfc7515/jws.py", line 102, in deserialize_compact
algorithm, key = self._prepare_algorithm_key(jws_header, payload, key)
File "/usr/local/lib/python3.7/site-packages/authlib/jose/rfc7515/jws.py", line 258, in _prepare_algorithm_key
key = algorithm.prepare_key(key)
File "/usr/local/lib/python3.7/site-packages/authlib/jose/rfc7518/_cryptography_backends/_jws.py", line 41, in prepare_key
return RSAKey.import_key(raw_data)
File "/usr/local/lib/python3.7/site-packages/authlib/jose/rfc7518/_cryptography_backends/_keys.py", line 119, in import_key
b'ssh-rsa', options
File "/usr/local/lib/python3.7/site-packages/authlib/jose/rfc7518/_cryptography_backends/_keys.py", line 277, in import_key
cls.check_required_fields(raw)
File "/usr/local/lib/python3.7/site-packages/authlib/jose/rfc7517/models.py", line 120, in check_required_fields
raise ValueError('Missing required field: "{}"'.format(k))
ValueError: Missing required field: "e"

With synapse version v1.20.1 works