Hard to tell as the post has a lot of other stuff coming out, but I can’t see any transaction in the pot, or in the main account, presuming that this works as other “pay from pot” where money is transferred from pot into account first (which you can see).
From what I’ve seen so far, it’s been set-up correctly. I have plenty of (Joint account) scheduled payments set up to be paid from the Bills pot and the transfer of the amounts from the BP to the main account just before the debit is taken from the main account has never failed.
The uninstall/restart/reinstall procedure would be my next suggestion.
As an FYI all my direct debits and subscriptions using a virtual card all pay from the pot as expected. Its just if I manually setup a scheduled payment.