Local development: cannot get past initial login screen

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Please complete the following checklist (by adding [x]):

• I have searched open and closed issues for duplicates
• This isn't a feature request
• This is not a report about my app not working as expected

I am following the "Getting Started" instructions in the root README. After running yarn workspace proton-mail start and navigating to localhost:8080 in my browser, I am met with a prompt for username and password. When I enter one, a Human Verification modal opens that again prompts me for a username and password. When I attempt to submit one, nothing happens. There are no other inputs, links, or options on either of the aforementioned pages/components. I have found other issues here about dealing with captchas, but none about local dev app being inaccessible due to login prompt.

• Is there a particular username and password I am supposed to supply?
• Are there any other instructions for running the app locally that are not referenced in the project root's README?
• Am I supposed to be seeing username and password prompts on the Human Verification screen?

I am using node v18.17.1 and yarn v3.6.2. Thank you for any help you can provide.

Start with the root README and reproduce yarn workspace proton-mail start on localhost:8080 using the reported Node and Yarn versions. Inspect the initial login and Human Verification screens described in the issue; the work is done when the required local-development instructions or credentials are established and the app can proceed past those screens.