Sign-in is successful but the step returns Error: 404 and stops

[aartajew]

I have a test with multiple steps (first sign-in, then open actual url I need to measure performance for).

Unfortunately the sign-in step always returns error 404, even if I see on the video and screenshot that the user signed-in successfully. The last step is therefore skipped/abandoned (shows "No data for test step").

See here for reference: https://www.webpagetest.org/result/230724_AiDcY2_AE9/

What is the reason for failing the sign-in step? Please help, I've tried everything (other browsers, multiple options, injecting redirects) nothing helps :(

Thanks in advance :)

PS. If you need to reproduce please contact me on priv, I'll let you know the creds needed for sign-in.
PS2. If it's helpful, combining steps with combineSteps helps, but I need to measure only the last step in the flow.