Did you ever find a solution for this problem with IPv6 support enabled?
I have the same problem:
2018-10-23 14:30:26,401 ERROR pid=19302 tid=MainThread file=base_modinput.py:log_error:308 | Traceback (most recent call last):
File "/opt/splunk/etc/apps/TA-MS-AAD/bin/ta_ms_aad/modinput_wrapper/base_modinput.py", line 113, in stream_events
self.parse_input_args(input_definition)
File "/opt/splunk/etc/apps/TA-MS-AAD/bin/ta_ms_aad/modinput_wrapper/base_modinput.py", line 153, in parse_input_args
self._parse_input_args_from_global_config(inputs)
File "/opt/splunk/etc/apps/TA-MS-AAD/bin/ta_ms_aad/modinput_wrapper/base_modinput.py", line 171, in _parse_input_args_from_global_config
global_config = GlobalConfig(uri, session_key, global_schema)
File "/opt/splunk/etc/apps/TA-MS-AAD/bin/ta_ms_aad/splunktaucclib/global_config/__init__.py", line 51, in __init__
port=splunkd_info.port,
File "/opt/splunk/etc/apps/TA-MS-AAD/bin/ta_ms_aad/solnlib/net_utils.py", line 129, in wrapper
'Illegal argument: {}={}'.format(arg, value))
ValueError: Illegal argument: host=::1
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