Hai
啓介 日高
This might be due to the failures in the document parsing and analysis that could result in this error. The format or content of the document is primarily to blame. Could you see if a document that passed earlier still functions properly in order to debug it?
you could use the Azure portal to open a support case and send the information to the support staff for additional analysis.
I suggest you to raise the support req, as mentioned plz find the link below for the support req
https://portal.azure.com/#view/Microsoft_Azure_Support/HelpAndSupportBlade/~/overview
If this helps kindly accept the answer thanks much.