I guess it was a temporary issue around that time period (August 7 - August 15), I was able to initiate the porting process yesterday ie August 21st without issues.
Rcom in my area not working on Lte 3 or 40. only on LTE 5. Though the spec page of this modem is silent about Band 5, still it is working with Band 5. i.e. RCom 4g