Hello @Yakov Keselman ,
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: Document Intelligence endpoint returns 404
Solution: After placing it in the proper region (East US, West US2, and West Europe), it started working
Public preview version 2024-02-29-preview is currently only available in the following Azure regions: East US, West US2, and West Europe
Here is the documentation you can refer to : https://learn.microsoft.com/en-us/azure/ai-services/document-intelligence/overview?view=doc-intel-4.0.0
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.