TER Upload: SOAP Error "not found"

I am trying to upload an extension release to extensions.TYPO3.org via a soap client.

So far I used helhum/ter-client and namelesscoder/typo3-repository-client.

namelesscoder/typo3-repository-client uses http://typo3.org/wsdl/tx_ter_wsdl.php as WSDL_URL.
helhum/ter-client uses https://extensions.typo3.org/wsdl/tx_ter_wsdl.php as WSDL_URL

Both fail with the message "Not found". See "Actions" on

• typo3_repository_client: https://github.com/in2code-de/groupdelegation/runs/1363237475?check_suite_focus=true
• ter-client: https://github.com/in2code-de/groupdelegation/runs/1363139391?check_suite_focus=true

Something changed here?