Hey!
The phrase "Scrutiny status of MCAR application is on hold" means that the processing and checking of your application is currently stopped or paused for a while. Scrutiny means when you look at something really closely, like when you are checking for mistakes. To put on hold means to postpone something; to stop the progress of something.

You can keep checking your application to stay updated about its progress. You can also contact the authorities to know the application status better.

Best wishes!