What it means
A transaction that reverts with the raw data 0xd76a1e9e hit the custom error InvalidCommandType, defined in Uniswap Universal Router. The explorer shows the hex because it does not have the contract's ABI to translate it.
The router received a command byte it does not recognise, which means the calldata was malformed, almost always a buggy or incompatible integration.
How to fix it
Use the official interface for the trade. If a third-party dapp produced this, report it there.