I successfully publish tweets starting with a user’s tag ("@sammyd11381748"), and I can see it from my account, but on the account in question ("@sammyd11381748"), I can’t see any notification for that tweet. The second account ("@sammyd11381748") is following my account. It’s not a private account (unless that’s the default). This used to work, but has started to fail on all accounts as of a few hours ago.
What do I need to do to get the mentions to appear again? Why did it stop working? Is my account considered spam?