Signing typed data with Argent multisig / account with guardians/cosigner causes wallet errors

[oscarwroche]

I've been trying to sign a message using the useSignTypedData hook but it doesn't seem to work when using an Argent multisig - an error appears in my wallet: FetcherError: An error occurred while fetching

It also doesn't seem to work with an account that has an Argent guardian, and the errors I get in the wallet are:

background.js:67 BaseError: This transaction failed as the cosigner could not provide a valid signature. Please contact support.
    at k3.ge [as cosigner] (background.js:75:126711)
    at async k3.cosignMessage (background.js:35:2471)
    at async k3.signMessage (background.js:35:2676)
    at async kE.signMessage (background.js:35:5537)
    at async Xw (background.js:67:727)
    at async ere.approveAndWait (background.js:71:2681)
    at async background.js:39:45126
    at async y (background.js:42:177)
    at async y (background.js:42:177)
    at async y (background.js:42:177)

and Parameter specified as non-null is null: method com.swmansion.starknet.data.types.Felt$Companion.fromShortString, parameter value

The message I am signing looks like the following (not sure if I should add something to my message):

 {
    title1: title.slice(0, 16),
    title2: title.slice(16),
    account: address,
    uri1: investorAppUrl.slice(0, 16),
    uri2: investorAppUrl.slice(16),
    issuedAt: new Date().toISOString().slice(0, 16),
    types: {
      Validate: [
        { name: 'title1', type: 'string' },
        { name: 'title2', type: 'string' },
        { name: 'account', type: 'string' },
        { name: 'uri1', type: 'string' },
        { name: 'uri2', type: 'string' },
        { name: 'issuedAt', type: 'string' },
      ],
      StarkNetDomain: [
        { name: 'name1', type: 'string' },
        { name: 'name2', type: 'string' },
        { name: 'chainId', type: 'string' },
      ],
    },
    primaryType: 'Validate',
    domain: {
      name1: investorAppUrl.slice(0, 16),
      name2: investorAppUrl.slice(16),
      chainId: getStarknetChain(chainId).id,
    },
  }