No application number(Gckey)- Visitor Visa

[Arub Piplani]

I applied visitor visa online for my parents through Gckey and successfully submitted application on 20th April 2023 but still application number is not generated and also I did not receive any submission confirmation letter in my account as its only shows Confirmation of Online Application Transmission when I click on check application status.Even in the submitted application grid, the status shows as submitted but application number is showing blank. Please help if anyone has experience similar issue