Hi Deepshikhaj,
The PDF form that you are trying to open in Adobe Acrobat Reader mobile application is an XFA form.
You will not be able to open it on the mobile device as it is not supported.
You will need to open this form on a desktop application.
Please use Adobe Acrobat Reader DC to open this form on Windows or Mac.
Make sure that you first download the document from the browser on your machine.
Then go to the location where you have saved the downloaded file and try to open it in Adobe Acrobat Reader DC.
Let us know how it goes.
If you experience any issue, feel free to update this thread.
Regards,
Meenakshi