UnexpectedTimepoint

A timepoint was supplied but no multisig operation is underway for this call hash; the first approval must open the operation with no timepoint. Pass maybe_timepoint: None on the opening call, or verify the call hash matches an existing Multisigs entry.

Declared by the Multisig pallet; it classifies to the semantic code invalid_argument.

Remediation

Check the argument values against the operation schema

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