Unable to highlight bold

after generating the report, we are unable to see those font style
aspose.png (226.4 KB)
In the above screenshot shows as tags that we need to convert into bold but currently we are unable to get those details.

and we are using the textfragment in the code side in the below screenshot mentioned
aspose1.png (70.7 KB)

In this case how we can proceed on further please suggest here

@kishore_k

Would you please share a sample console application along with sample PDF document(s) with us so that we can try and replicate the issue in our environment? We will address it accordingly.