Get public facing IP address. Different websites giving different IP's

Question

I don't know too much about networking concepts, trying to get my public facing IP address programatically (powershell preferred)

Trying these different websites

• https://www.whatismyip.com/ # 🌟 Only this one seems to work when I am trying to RDP into the machine (Azure NSG inbound rules) 🌟
• ipinfo.ipidea.io # this gives my modem/ISP address
• https://api.ipify.org/?format=json # this gives my modem/ISP address
• ifconfig.me/ip # this gives my modem/ISP address

Is there an alternative way to get the IP address shown by whatismyip.com website [for free]?

please don't go into "pay them you cheap pos"; It's a company project, and my boss man doesn't want to spend anything currently

I could use my local computer IP address, but we use a VPN (company wide), and hoping to get the address of this VPN provider

Edit: adding more clarity

I think I need the IP address of the VPN provider I am connected to. The browser/whatismyip is somehow able to get it. I need this address programmatically. Are there any free other APIs that provide this info?