Generally the VTEX kuberouter will block outgoing HTTPS requests, although linked apps may be an exception to this rule for some reason.
The solution usually is the VTEX route without https, for example:
https://${context.account}.vtexcommercest....
Use http instead https and then set an X-VTEX-Use-Https: true on header.
This will allow the request to get through the router, and it will be changed to HTTPS once it leaves our infrastructure