I sloved this , bec the document xml need full Formatting.
If lib SDK when call sign dicument simple reject doument bec not full formating formating , will be fine for all starter.
If you are still facing issues with the signing process, please share your concerns via the SP email along with the following detailed information to ensure a comprehensive understanding of your situation and provide the exact needed support:
Prerequisites:
Postman environment setup
The Fatoora portal is accessible.
Familiarity with the e-invoicing technical guidelines published by ZATCA