Youview error code; YVM3503. Details of my Sony KD-55AF9. Firmware PKG6.5042. Youview version 2020-11-26-d18b31ab1e. Ok so have tried all the simpler soft reset of both tv and router, forced a stop of the youview app and cleared its cache and data from the app preferences then restarted youview (aka Live TV & Catch-up) all to no avail. Still no MyTV working. I have now resorted to going back to square one. Full factory reset. Configured the internet connection via Ethernet cable. Signed in to Google and accepted all loading agreements.
next step was to configure the TV source. I figured that as youview is streaming TV I could safely skip this section and move on to completion.
what I didn’t expect was that Youview couldn’t access the TV guide until the digital aerial had been configured. Therefore I configured the tuning reception of the digital aerial only. I ignored the Freesat configuration.
Then I went back into the Live TV & Catch-up to see what now worked. I was pleased to see that the full guide was functioning correctly and also surprisingly the MyTV button was also now working. So all good so far.
i have encountered two anomalies that have a direct impact on the built in you view. The first is that if you physically record a programme on a digital channel you can’t  access anything in the youview guide to watch immediately whilst a programme is being recorded. This is definitely annoying. I will leave the tuning of the satellite channels to a later date.

24 hours later and back to square one! The MyTV section has failed and gone back to the original unhelpful error message with code YVM3503.

There is clearly a bug in this application that has plagued the Youview integration on this particular model of TV from day one.

Is Sony going to fix this properly? It makes no sense that I can use the recording features to record Freesat and Freeview but Youview which could and should be the best option appears to be only partially completed software. This is a top of the range Tv yet one of its key features is full of bugs and incomplete. It’s very frustrating. 

The below photos  show the youview app version, Youview’s MyTV bit working correctly then youview’s MyTV not working less than 24 hours later.

Youview app versionYouview MyTV workingYouview NOT working...again!