Unable to log in roon community using iPhone's safari or Chrome browser

I used my iPhone 12 pro [iPhone’s operating system of 14.6] and tried to log in roon community using Safari and Chrome brwosers. After I input email and password, a " Login Error" with a line of “Account login timed out. Please try logging in again” was showed on the screen. I tried several time and failed with the same result. Then I switch to login in on my iPad and Windows 10 PC, I did it successfully . What’s the problem here? Do I miss something?

A couple minutes ago,I found a way to log in my account using my iPhone by taping roon app’s community section. But I’d still like to know why I can’t log in directly using the browsers in my iPhone.