Problem syncing Zoho inventory and Shopify

Problem syncing Zoho inventory and Shopify

Hi,
Zoho inventory is not syncing anymore my sales orders from Shopify.
The sales orders are still open and not fulfilled in Shopify.
I've tried to sync manually, it works for the products but not for the sales orders.
The process was functioning two weeks ago but not anymore
Can you please help me ?
Thank you in advance,
Best,
Arnaud