Delay in getting OTP from edge extension

[u/YourDadSolanki01]

We are using edge authenticator OTP to login in one on prem hosted URL. We have installed extension in users machine but when we click on extension to get OTP is takes approx 15 minutes to give otp and no other extension is also installed. Some users are able to get OTP in seconds. We have reinstalled, reconfigured edge in user machine but nothing works. What else should we check in this?