The admin of that proxy is https://polygonscan.com/address/0x8cfc0974780dDa5D754FFc52C00184d52994B3BE which is an EOA, not a contract. So you would have to use the account 0x8cfc0974780dDa5D754FFc52C00184d52994B3BE to call the TransparentUpgradeableProxy's changeAdmin function.