I thought I took a screenshot of the issue but I can’t find it. Something to do with blocknotify even though I clicked save to accept the modifications.
After that didn’t work, I tried installing Bitcoin Knots but still had a similar issue. 
Discussion
I had that issue too. If you saved that curl... Line in the block notify section in knots. Then you might need to open and save config again in Datum.
That solved my issue.
I don’t use telegram but I might try what you said. Thanks! 🤙
that's correct. datum needs to grab the pointers from bitcoind again and realize that blocknotify is set correctly