Saturday night's launch show saw this year's celebrity contestants – including BBC Breakfast presenter Walker – paired with their professional dance partners for the first time, and also featured group performances from the pro dancers.
The dance spectacular was watched by 7 million people, giving it a 44.7% share of the live viewing figures.
Ex-Good Morning Britain presenter Morgan tweeted a link to the ratings report and teased: "Congrats @mrdanwalker", along with a thumbs-up emoji.
Watch: Who is Strictly's Dan Walker?
Strictly's standalone launch episode – introducing the judging panel and the contestants, as well as pairing them with their dance partners ahead of the competition – was introduced in its eighth series in 2010.
That first launch episode 11 years ago was watched by 8.7 million viewers. The figure dipped to just 6.8 million and then rocketed to its peak in 2016, when 9.3 million people tuned in to watch the launch.
Last year, despite limits being placed upon the show due to the coronavirus pandemic, viewing figures for the launch episode climbed to 8.6 million.
So this year saw a drop of 1.5 million people tuning in to the pre-recorded Strictly launch.
As well as the unveiling of this year's fist all-male coupling between Bake Off's John Whaite and Johannes Radebe, this year's launch saw pro dancer Anton Du Beke make his debut as a full-time member of the judging panel.
Alongside Walker, this contestants also include McFly's Tom Fletcher, Gordon Ramsay's daughter Tilly Ramsay, Olympic swimmer Adam Peaty, EastEnders stars Nina Wadia and Rose Ayling-Ellis and former Bake Off winner John Whaite.
Judges Craig Revel Horwood, Motsi Mabuse and Shirley Ballas will be back, but Du Beke is filling in for Bruno Tonioli.
Tonioli is unable to take part because of the complications of travelling between the UK and the US, where he judges Dancing With The Stars, amid the pandemic.
The shows were all filmed on site at Elstree Studios in Borehamwood, north London, with no studio audience present, and the professional group numbers were filmed in advance.