Unable to retrieve fulfillment order ID XXXXX from Shopify. Please contact technical support

I am receiving the above message from the API:

POST /admin/api/2021-01/orders/XXXX.json

x-request-id: 8b9e764b-8f03-49fd-a3f1-0a6f4d43fcca

Can someone help, please? Shopify Support Chat referred me here.

Happy to provide more details privately.

Hey @Marc_Lawson

Thanks for raising this! I’ll send you a DM.

Thank you very much for the help. Tech support was also able to give me a
hand with this and the situation is now resolved.

Thanks again!