A VPN is not required for everyone.
If your service works normally without one, there is no reason to use a VPN just for IPTVV.
If you experience buffering or connection problems that appear to be related to your internet provider, trying a reputable VPN can help determine whether routing or ISP interference is involved.
If you already use a VPN and IPTV is not working, try turning the VPN off as a troubleshooting step.