AirPlay YouTube from iPhone to AppleTV over LTE w/ No Hotspot

Question

The goal:
My goal is to AirPlay Youtube videos from the iPhone 6+ on iOS8.1 to the AppleTV v3 on 7.0.1 over LTE without using the iPhone as a Hotspot.
The problem:
The problem is that streaming video from internet sources does not function. However, I can do AirPlay mirroring of browsing websites over LTE. I suspect that I am making a mistake in my network configuration OR that what I am attempting to do is not possible.
The hardware:
To achieve my goal, I am using three hardware components: (1.) the iPhone 6+, (2.) the AppleTV v3, and (3.) a TP-LINK TL-WR702N Wireless N150 Travel Router.
Travel Router Configuration:
Firmware version: 4.18.96 Build 140729 Rel.58334n
Hardware Version: WR702N 1.0
LAN IP: 192.168.0.254
Subnet Mask: 255.255.255.0
Wireless Mode: Router Mode
Wireless Radio: Enable
Name  (SSID): Geek-Now-Boss-Later
Channel: Auto (Current Channel 6)
Mode: 11bgn mixed
Channel Width: Auto
Wireless Security: Disable Security
Wireless MAC Filtering: Disabled
Transmit Power: High
Beacon Interval: 40
RTS Threshold: 2346
Fragmention Threshold: 2346
Enable WIMM: Yes
Enable Short GI: Yes
Enable AP Isolation: No
DHCP Server: Disable
Start IP Address: 192.168.0.100
End IP Address: 192.168.0.199
Address Lease Time: 120 Minutes
Default Gateway: 0.0.0.0
Default Domain: [BLANK]
Primary DNS: 0.0.0.0
Secondary DNS: 0.0.0.0
In the router, I have reserved my AppleTV's Wireless MAC Address to: 192.168.0.100
AppleTV Network Settings:
Settings >> General >> Network
Wi-Fi: Geek-Now-Boss-Later
Network Name: Geek-Now-Boss-Later
IP Address: Manual 192.168.0.100
Subnet Mask: 255.255.255.0
Router: 192.168.0.254
DNS: 192.168.0.254
iPhone 6+ Network Settings:
General >> WiFi
Joined: Geek-Now-Boss-Later
Static IP Address: 192.168.0.101
Subnet Mask: 255.255.0.0
Router: [BLANK]
DNS: [BLANK]
Search Domains: [BLANK]
What I am able to do:
Use the AppleTV remote APP on my iPhone to control the AppleTV.
Use AirPlay to stream music on my iPhone to the AppleTV.
Use AirPlay to stream video on my iPhone to the AppleTV.
Use AirPlay to do iPhone mirroring.
Browse the internet over LTE and mirror various webpages to the AppleTV.
Load the YouTube APP on the iPhone and mirror YouTube video search results to the AppleTV.
What I am NOT able to do:
Load video from YouTube and have it play over AirPlay.
The "loading spinner" is displayed on the television AppleTV and on the iPhone.
After a time, the video fails to load and this error message appears in the YouTube video placeholder on the iPhone "Playback error / Tap to retry." At the same time, this error message appear on the television: "An error occurred loading this content. Try again later."
If, while the video is loading, I switch AirPlay FROM the AppleTV TO the iPhone, the video loads fine and I can watch it on my iPhone.
Any suggestions or insights would be appreciated!

Answer 1

Hey,
I'm using the exact same setup for my car, and am facing the exact issue.
I suspect the problem is from how YouTube app works. All the "What I am able to do" and "What I am NOT able to do" make me believe that when Airplay-ing a video with YouTube app on iPhone, it sends the url to Apple TV, asking Apple TV to download the video directly over its own network. With our network setup, the router is not connected to any internet source, resulting in endless spinner on screen.
I'm not sure if there's any workaround solution without turning on Hot Spot... please let me know if you found any.