A Microsoft file hosting and synchronization service.
I just received the same response from Microsoft Tech Support that others received back in January. Any One Drive inquiries on search not working are marked "resolved", the ticket is immediately closed, and the official response is:
Thank you for contacting OneDrive Team. We hope you are doing well. Please accept our apology for the inconvenience this may have caused. Rest assured we are here to help you.
As per the update from our level 2 team, this has been identified as a known issue. Our Engineering team has acknowledged it, and a bug report has been filed. We are diligently working to resolve the issue and minimize its impact on our global user base. It has been added to our development pipeline and is expected to be addressed in an upcoming product update.
We appreciate your assistance in identifying this problem. Please continue to check for updates to the app; we aim to release a fix shortly, although we cannot provide a specific ETA as the solution is currently being developed. Please be assured that we are working diligently to resolve the matter as quickly as possible.
We apologize if our confirmation made you feel upset. We would like you to consider that our only intentions were to resolve the issue as conveniently as possible for you.
Please accept our heartfelt apologies for any inconvenience this may have caused. Though, we were unable to resolve this issue, we remain at your service for any future assistance you may need, and we would be more than happy to help with any other concerns. Your satisfaction is of great value to us, and we are always here to support you in any way we can.
Once again, thank you for your understanding, and please do not hesitate to reach out if you need anything else.
Have a great day & a blessed life ahead!