Hello, I'll clarify this complain by example.
Example
- Failed/Successful mention notifications in web is activated in my account
- I pinged another account (user:Alaa) like this {{ping|Alaa}}
- user:Alaa received a notification that I pinged him
- I don't receive any Failed/Successful mention notification
Per Manual:Echo that the user must sign his or her message, so I made another try with sign, but also user:Alaa received a notification that I pinged him, but I don't receive any Failed/Successful mention notification.
It's not specific in Wikidata, as I faced the problem at first on Arabic Wikipedia.