Hi @Ashish Panjwani ,
Welcome to Microsoft Q&A Platform. Thank you for the question.
Is there any way I can use Thread Id for replying to the same thread?
We can use the Message ID only as per the design. And I can't see any option to use the Thread Id instead of Message ID.
I am not sure what is the use of Thread ID.
Thread Id is the ID of the thread the message belongs to associated with a specific email message.
I tried to replicate the issue and I can see using the same message Id I am able to send the reply, Please refer below screenshot.
If this is something different please share your flow so we'll try to replicate it.
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