iPhone automatic App Updates not working

It seems like ages now that I have had to have been manually updating apps despite having the automatic update option turned on. I have made several attempts to resolve this with the apple help desk, but they seem unable to work out what the issue is.

I wondered if anyone else has had this problem and resolved it.

Things Ive tried with Apple support :

1) Log out of App Store log back in. Restart Phone

2) check for latest IOS update

3) Make sure payment option is a valid card

4) Make sure I can manually update apps

5) Check for VPS on phone

6) Check Time Zone

The latest solution from Apple was to Delete the app and re-install the app.... REALLY !!! of course this will update it to the latest version, but you can't be expected to that every time.

Yesterday ( 07/09/2023) I had 38 apps that had not updated a few of them over 5 days old !!!

Do auto updates happen at a particular time. ? Does the phone need to be charging ? Auto update is set for Wifi only

Any help would be appreciated but im resigned to manually updating apps at the moment. Which seems wrong !!!!