Aha... so it's Projectivity is it? I'll try disabling and see if it'll then let me update iPlayer to the latest version (I couldn't find a way with it installed)
AndroidTV
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Ok, it's not Projectivity. It looks like iPlayer has been removed from the app store on that device, so it can't be updated to the fixed version. Boo.
I was advised that version 1.4.126 of the iPlayer app is needed. Here you go https://www.apkmirror.com/apk/nvidia-lightspeed-studios/bbc-iplayer-android-tv/bbc-iplayer-android-tv-1-4-126-release/bbc-iplayer-nvidia-shield-tv-variant-android-tv-1-4-126-android-apk-download/download/?key=7ff2fb19f5595c75a871c90173b8c238db91e6ff&forcebaseapk=true
Using this version of iPlayer got it working for me but I'm glad you found another way. Hopefully there are no further issues with it.