Thanks for your detailed feedback.
I've gone quite far in trying to get eBay to force a captcha on me, but haven't been able to in the app.
In the video it looks like an internal eBay issue as they just redirect you to the first login page instead of continuing the process. As the eBay login completely deletes Cookies on every try, either your IP Address or your account is flagged by eBay.
Some things you could test are to get a different IP (e.g. switching on or off WiFi) or enabling 2FA for your eBay account.
The next update will include some minor changes that might help, but I'm not too positive about it.
I'm sorry that I don't have better news for you at the moment, but troubleshooting issues that are locked behind your login credentials is a big problem