[Partially Lost] Royal Carols: Together at Christmas (2021 full episode)

I’m trying to track down the full 2021 episode of Royal Carols: Together at Christmas - the first year it aired, filmed at Westminster Abbey. The 2022–2024 specials are easy to find on BritBox in the US, but 2021 is nowhere to be found.

So far I’ve checked:

• BritBox (US) - only has 2022–2024
• ITV streaming - Royal Carols is not listed
• YouTube, Apple TV, Amazon Prime - nothing
• General web search - nothing but short highlight reels

It appears it may have been available on Facebook Videos (https://www.facebook.com/watch/?v=526859728290961) but now how partially muted audio.

Does anyone know where the complete 2021 broadcast exists?

Thank you - any leads appreciated AND WILL BE COMPENSATED ONCE FOUND!