Nick Sheppard, 04/05/20 11:16:
Thanks Federico - I'm struggling to access oabot - 502 Bad Gateway - it's a while but I think affected me last time I tried.
Works for me. Try deleting your cookies for the tools.wmflabs.org domain. I'm not sure why this happens: I see the same bug reported for other tools but couldn't find a permanent solution quickly.
Federico