There may be a poor cell phone reception that may stall your OTP SMS.

There is also a possibility you may have an incorrect mobile phone number registered in Board.Vision. You can check with your administrator whether your mobile number is registered in Board.Vision.

Alternatively, you can generate your OTP by using an Authy App.

For more information on how to download and install Authy, you can refer to the link below:

Downloading and installing Authy app