one tab login not support the Mac Chrome

Hi Support,

I am trying to log in Via the google one tab in Mac on chrome getting the below
This site cant be reached

For the Andriod platform below are the issues.
1. For Chrom browser one tab login option is showing but after selection of account it shows error,
2. For Firefox it is not showing the one tab account login option

Description

On iOS chrome, one tab is not working.

1. For iOS firefox one tab account pop-up is not showing.

The page I need help with: [log in to see the link]