I am also having an issue claiming the items from the Bridgerton event.
Last week I had no problems, I logged in everyday and claimed all the available rewards.
Then today I attempted to claim the available rewards, I clicked "Claim All" and there was an error message, and now all of them are greyed out, including thre ones I had claimed last week.
Upon checking build/buy mode, the items I claimed last week are all there, and one of the items this week, Lady Whistledown's Society Papers is also there. But the second item I attempted to claim today, the handkerchief, did not show as claimed and is not in build/buy.
When I attempted to go to Events, the icon is paled out, and shows this message, "Please wait and try again as the Gnomes try to fix the failure."
I hope this is resovled quickly. It is rather frustrating having a timed event, logging in to claim rewards and then not being able to recieve said rewards. I wonder how many other people might be experiencing similar issues with this event.