Weblink https://xyz.com/customers.html hosted externally not opens only from internal company domain

Hello,
Weblink https://xyz.com/customers.html hosted publicly not opens only from internal company domain abc.com
Checked that the site is whitelisted in proxy server by the team
Network team confirmed that the ip address of the server hosting the webpage is reachable from the internal network
Our internal DNS is AD integrated in which forwarders are configured to use our company external DNS Linux server for the queries not resolved by internal DNS.
N.B: The same weblink is accessible when the employee is outside of company internal network
Found a solution at the below link but looking for another solution as suggested in the link too if the counts go in 100's wherein the workaround scales badly
Any advice please.....
Thanks
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