What happened
A notification about an operation you did not start deserves investigation. It does not prove account compromise by itself, and it is not something to approve merely to clear the alert. Separate a real Steam account record from a chat message or browser banner. The first question is whether the notification corresponds to an identifiable offer, login, or action inside your own account.
What to check
Open Steam directly rather than using the message’s external link. Find the matching notification or offer and inspect recipient, items, direction, and creation time. Compare those details with operations you intentionally requested. If no known action explains it, leave approval untouched and review official security options. Do not accept a stranger’s instruction to perform a verification trade in order to protect your remaining inventory.
Worked example
For example, an alert arrives while you browse a skin catalogue, although you never requested delivery. The close timing does not tie it to that page. An actual offer may have a different origin, while a chat-only message may have no matching record at all. Capture the distinction before blaming an unrelated click or submitting a new transaction to see whether the account still works.
Result and next step
The resolved outcome identifies a known operation or keeps the unexplained request unapproved while it is investigated. Record the timestamp and offer reference when available, hiding private account data. If unauthorized access is suspected, use official account help from a trusted device. Read Steam security advice and trading practices. A saved CASECS2 link does not give blanket permission for unexpected operations.