From your screenshots few things are mentioning here
Looks like Both SIM cards are activated with Mobile data
Once Turn off the data connection on both sim cards by switching the network
Under SIM Cards Menu, Choose Jio 4g is Mobile data
Also Toggle on the Roaming as your second sim card shows "R" which indicates network is roaming, unless you toggle on ,data connection will not enable completely
Then See that Wifi calling is enabled or not
Most of the time it take time to detect and enable that option
Even you can try to reset the network and if possible device reset could fix such issues
Comments
From your screenshots few things are mentioning here
Bro HMD Global has not enabled wifi calling for Nokia 5.1 plus. That's why there is no option for wifi calling like another nokia device.
Its already enabled..try to use jio or airtel..as primary sim then retry
Still no airtel volte in west bengal 😩😭
The problem is in the airtel side and they will soon enroll the device in its portfolio
Airtel has both Volte and Vowifi in West Bengal . i have both , you should contact airtel and tell this.