Punjab National Bank [PNB] — getting message "connection error" when trying to connect my fastag account using myfastag app.

Address:

H.No.234, G-Block, Govindpuram,, Ghaziabad, Uttar Pradesh, 201013

I have a saving bank account with your bank. I have applied for a pnb fastag online from your pinjab national bank's website. After completing all the formalities, a20667 reference number was sent to me on 24th december, 2019. Further they intimated to me that my application no. App0127518 for punjab national bank fastag has been approved. Tag id ending with 5358 has been assigned and registered against my vehicle rc no. K0972896 on 8th january, 2020.
When i tried to open my fastag account using myfasgtag application, i am getting the message "connection error". Screen shot of "connection error" is enclosed herewith.
Please do help so that i may be in a position to login in my fastag account.