I tried via this address
Your partner for growing your business on Google Play. Discover the tools, analytics, and best practices to release with confidence, monetize effectively, and scale your apps and games globally.
And click the button Go to Play Console on the upper right.
After that button clicked, new page appeared asked to Sign In & it worked OK, I can acces my console.
On post # 1, I didn't go to
https://play.google.com/console/about/, instead go directly to the Sign In page, because I already bookmarked this page.
After, Sign In, the page loaded about 70% then error raised. It turn out that the Sign In page has changed and Google didn't remove the old address or redirect to the new address.