Microsoft maintains a list of supported Android devices for their Microsoft Office apps, and this list is regularly updated. It's possible that Realme devices were removed from the list due to compatibility or performance issues.
You can check the current list of supported devices on the Microsoft support website. The list is updated regularly, so it's a good idea to check back periodically if your device is not currently supported. You can also contact Microsoft support for more information about specific devices and when support may be added in the future.
Additionally, you may want to check with Realme to see if they have any information about their devices' compatibility with Microsoft Office apps or any updates on when support for their devices may be added.