r6700ax router blocks my iptv app from firestick max

Whatever IPTV App you talk of here, Several IPTV Apps like Roku for example, are location restricted. ROKU is often not available outside of the US.

Further on, it can happen your ISP can block certain "services". You might have to use some VPN service allowing to set a virtual location to work around these restrictions.

Unless you have subscribed some content management services like Netgear SPC or Circle, there is unlikely any other security blocking anything.