temMALFORMED on "NFTokenMint"

I was minting NFTs from my Shopify app and signing with Xumm without problems until yesterday. Could you please help me? Here the info of the transaction:

Signed tx hash: 9261114965EE879FA842814EC1FC880FE33E6CA9F5C7F29621243A4A4E72C906
Payload:
{
TransactionType: "NFTokenMint",
NFTokenTaxon: 1,
Account: "rDnHqD11jB9HdFx3YmHTbQc8GScDd8BQfM",
URI: "697066733A2F2F516D53696A6139567774687459417070627762346E3769476F3647774C534B79735742647A655673344A4A6A6F33",
Flags: 1,
TransferFee: 10
}