Hello @Harsh Khewal , I'm glad that you were able to resolve your issue and thank you for posting your solution so that others experiencing the same thing can easily reference this! Since the Microsoft Q&A community has a policy that "The question author cannot accept their own answer. They can only accept answers by others ", I'll repost your solution in case you'd like to "Accept " the answer.
Issue: Resource not found" when using document intelligence API
Solution: Changing resource region to West Europe resolved this error.
This may be a temporary issue as we have no ongoing issues reported. Please try again later or consider changing the resource region, which may resolve the issue.
If you have any other questions or are still running into more issues, please let me know.
Thank you again for your time and patience throughout this issue.
Regards,
Vasavi
Please remember to "Accept Answer" if any answer/reply helped, so that others in the community facing similar issues can easily find the solution.