I'm getting the same error (MLResult_UnspecifiedFailure) every update frame when in editor. To the best of my knowledge this isn't causing any issues when I build onto the device. The errors show up whenever I enable the speech input under the MRTK script.
From what I can see its a unity editor call only, which explains why the build is still fine. I was initially gonna edit the code to ignore the permission, but the script is from an external source and I cant edit it.
And yes, I do have the permissions enabled.
Unity Editor version: 2022.2.17 ML2 OS version: 1.2.0 MLSDK version: 1.6.0 Host OS: Windows
De-select "Magic Leap App Simulator" from the XR Plug-in Management options for "Standalone" (as show in the screenshot). The errors may persist, unfortunately, but you will be able to Play as expected.