Unable to use the grant and revoke commands

Whenever executing the `grant` or `revoke` commands, an error is returned from the API.
```
POST /api/v1/mods/realitymod/grant: 400,  map[$.permission:[The JSON value could not be converted to VUModManagerRegistry.Models.ModPermission. Path: $.permission | LineNumber: 0 | BytePositionInLine: 42.]]
```

Seems like the permission enum is not correctly being parsed