Found it here: https://github.com/oVirt/ovirt-engine-keycloak/blob/master/keycloak_usage.md. It's admin@ovirt@internalsso.

Am 22. September 2022 19:02:56 MESZ schrieb jonas@rabe.ch:
Hello all

I just recently installed a fresh oVirt appliance. Now I want to use the API to perform some actions but fail to provide the correct username. Can you help?

Here's my script:
import ovirtsdk4 as sdk
from getpass import getpass

dc_name = "Default"
clu_name = "Default"

connection = sdk.Connection(
url="https://ovirt-engine-test.admin.int.rabe.ch/ovirt-engine/api",
username="admin@ovirt",
password=getpass(),
# ca_file="/etc/pki/ovirt-engine/ca.pem",
insecure=True,
)
...

That's the error I get:
Traceback (most recent call last):
File "/home/user/ovirt_iso_script/./setup_networks.py", line 25, in <module>
dc = next(d for d in dcs_svc.list() if d.name == dc_name)
File "/usr/lib64/python3.10/site-packages/ovirtsdk4/services.py", line 6863, in list
return self._internal_get(headers, query, wait)
File "/usr/lib64/python3.10/site-packages/ovirtsdk4/service.py", line 202, in _internal_get
context = self._connection.send(request)
File "/usr/lib64/python3.10/site-packages/ovirtsdk4/__init__.py", line 371, in send
return self.__send(request)
File "/usr/lib64/python3.10/site-packages/ovirtsdk4/__init__.py", line 389, in __send
self.authenticate()
File "/usr/lib64/python3.10/site-packages/ovirtsdk4/__init__.py", line 382, in authenticate
self._sso_token = self._get_access_token()
File "/usr/lib64/python3.10/site-packages/ovirtsdk4/__init__.py", line 624, in _get_access_token
raise AuthError(
ovirtsdk4.AuthError: Error during SSO authentication access_denied : Cannot authenticate user No valid profile found in credentials..
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