Thanks @t-p @burbankstarling @hayes12
We were testing the setup internally before making it available publicly, may be that’s why you might have temporarily seen 404
Are you still seeing errors?
robots.txt is at the global root
After a lot of troubleshooting, finally the only change that made it to work was changing the Site and Home URL in the database wp_options table
update wp_options set option_value = 'https://namegulf.com/resources' where option_name = 'siteurl';
update wp_options set option_value = 'https://namegulf.com/resources' where option_name = 'home';