524 Issues only for a few users in Spain

Hello All,

I am stuck running around to solve 524 issues.
We have a few users in Spain who cannot access our site. We are on Agro routing as well.

Most users around the world can access the app but a few selective users in Spain get 524 errors.
Our servers are free. The puzzling part is that it is not for all users in Spain.

What could be the route cause? We are hosted on GCP we tested with user IP the firewall is open.

Thanks & regards,