Hi Miguel,
Thanks for reporting this issue.
1) We are able to see the problem with XlsIO and DocIO and will have a fix available as soon as possible.
2) In the meantime, please make the following changes to pass certification for other controls
Run Notepad in administrator mode and open this file
C:\Program Files (x86)\Syncfusion\Essential Studio\10.3.0.64\SDK\SDKManifest.xml
Delete entries for DocIO and XlsIO
<File Reference="Syncfusion.DocIO.WinRT.dll"/>
<File Reference="Syncfusion.XlsIO.WinRT.dll"/>
Save and close the file
3) Open this folder, copy the XlsIO dll and DocIO dll to some other location for backup and delete them from here
C:\Program Files (x86)\Syncfusion\Essential Studio\10.3.0.64\SDK\References\CommonConfiguration\neutral
Now, clean the solution and rebuild it. It should pass certification now.
Please let us know if you still have any problems. Sorry for the inconvenience.
Best,
Stephen