New setup with the wizard fails with 405

Hi there, trying to onboard a project in a new tenant, completely greenfield.
I created a Posthog tenant in the EU region, then ran the self-driving wizard, I get to the authorisation screen, confirm it, then the wizard reports that it cancelled the process.

I checked the logs and I can see it fails with a 405 on the OAuth endpoint.

[2026-09-02T09:20:38.651Z] [oauth] attempting callback server on port 8239
[2026-09-02T09:20:38.664Z] [oauth] callback server ready, showing login URL
[2026-09-02T09:20:45.132Z] [oauth] callback received with authorization code
[2026-09-02T09:20:45.164Z] [oauth] exchanging code for token at https://oauth.posthog.com/oauth/token
[2026-09-02T09:20:45.256Z] [oauth] token exchange failed (HTTP 405): Request failed with status code 405
[2026-09-02T09:20:45.258Z] [oauth] flow failed: AxiosError: Request failed with status code 405

Not sure whether there is a workaround or whether I should just wait and try in a few days?
Thanks,
Max

Start with the self-driving wizard's authorization flow and trace the callback server from the authorization screen to the token exchange at https://oauth.posthog.com/oauth/token. Reproduce the 405 and identify why the OAuth token request is rejected; done means a new EU tenant can complete setup without the wizard cancelling.