Unannounced

The proxied call was executed before its announcement matured, or no matching announcement exists at all. Check the proxy's Announcements entry for the call hash and the delay on the proxy registration; enough blocks must elapse between announce and proxy_announced.

Declared by the Proxy pallet; it classifies to the semantic code too_early.

Remediation

The required window has not opened yet; wait some blocks and retry

The same explanation is available in the terminal: btcli explain Unannounced.