Purchased new Apple Watch Ultra 2 - Where are my Apple Fitness Monthly Challenges?

Last week I bought myself a new Apple Watch Ultra 2 through my mobile phone provider and it's awesome - a great upgrade from the original Apple Watch Ultra I sold off last November when some extra funds were needed.

There's just one apparent, and annoying, glitch that I've encountered: try though I might, I cannot find - nor successfully encourage my iPhone and Watch to offer up - a personalised Apple Fitness Monthly Challenge that I can once again pursue, as before, with great enthusiasm. My achievement badges end at October 2023 - the latest earned before I sold my Apple Watch Ultra - but it's now the start of a new month and there's no announcement of a July 2024 Challenge.

I've followed advice I researched yesterday to resolve the issue - restarting, resetting, unpairing then re-pairing both my Watch and my iPhone - but nothing has changed.

Please, if someone out there can suggest a way to restore Monthly Challenges for me, do share with me and with others here - any assistance would be most gratefully received.