Hey aspirant,

You need not worry. Though you won't get a new original migration certificate, you will be able to obtain a duplicate migration certificate from NIOS. For this, you will have to fill an application form stating that you require a duplicate migration certificate, along with a bank draft of Rs 200 which should be sent to the address given in the link below. Additional charges may apply for postal services. You can also find the application format here.

https://www.nios.ac.in/student-information-section/procedure-for-obtaining-duplicate-certificate.aspx

In case you need the duplicate migration certificate urgently, you will have to submit the application directly at NIOS headquarters in Noida, you will receive the duplicate certificate within 48 hours and it will cost Rs 400.

Hope this is helpful.