Informed Delivery quit working

Haven't ever used that app and I have well over 100 apps installed and everyone of them has worked. I would contact the developer and report your issue.
 
I had to reinstall this app after updating to Pie. It's working how now I receive 2 notification emails from the postal service.
 
shows last updated Sept 11 2018
so might need the dev to update it if none of the others stuff perform fixed it.
 
For informed Delivery, you need to empty the cache and clear the data and log in again and have the post office send the text for the device approval. Then it will work again. I went through it last week.
 
For informed Delivery, you need to empty the cache and clear the data and log in again and have the post office send the text for the device approval. Then it will work again. I went through it last week.

Great fix ..
 
Well, informed delivery worked for a while after the fix I posted. Last night it failed again, so it looks like the fix only fixes it for about a week. I am hoping that the post office produces an update to the app soon. It hasn't been updated since September and probably not written for Pie. I have given them feedback but don't know if they read it or not.