Both my husband and are with BT mobile. We use Barclays mobile banking app. Despite both our accounts being set up to receive notifications, i.e. when money goes in/out etc., neither of us receives the alerts. We both have Samsung Galaxy A20e phones. Have spoken with Barclays who say from their end all is OK we should try our provider. Before I do anyone had a similar experience please? Odd thing is when I originally set my app up I used to get the alerts.
It could be an update that failed for some reason.
Go into Settings-> Apps & Notifications-> Select your app ->Storage & Cache and tap on Clear Storage.
That will leave the app but all your account info will be gone, i.e. you can set the app up again from scratch without uninstalling it
According to Google Play, the Barclays app was updated on 02/03/21, would this be about the same time it stopped working? Presumably yours will have updated in the background very soon after.