I understand your point, but in my case the payment issue is not something that started with the iOS 27 update. I have actually been facing similar Apple payment issues since April.
In April, the amount was deducted from my bank and the auto-payment mandate was active, but Apple said they had not received the payment. I had to pay again in the first week of April and then again on April 26, after which I continued making the payments on the 26th of each month.
On September 26, the payment was rejected even though the same payment method and auto-payment mandate were still active and available. Since then, my iPhone has been repeatedly asking me to update the payment method for iCloud+, Apple Music, Apple TV and Apple Arcade.
The confusing part is that I have only one active iCloud+ subscription. Apple Music was recently activated with a 3-month free offer, although Apple still deducted an amount when I set up the payment method, and its next payment date is showing as November 20, 2026. Apple Arcade is something I have never subscribed to. Apple TV was included automatically as part of the free bundle with iCloud+.
More importantly, under each subscription, Apple itself shows the same payment method as the active payment method. When I try to add it again, I get the exact error shown in my screenshot: “This payment method has already been added to your account.”
So my concern isn’t simply that the prompt appeared after updating iOS. The payment method is clearly already on the account, has been successfully charged before, and is still displayed against the subscriptions. There appears to be some issue with Apple’s billing/payment status or reconciliation that is causing these repeated prompts.