Issues Dialing into a zoom meeting - password not recieved

Hello

I am required to dial into meetings via phone and when I do I enter the meeting ID followed by # (and this works fine)

Then I am asked to put in participant ID and/or passcode  when I do so (sometimes) it doesn't recognise it; and, to be clear it doesn't recognise that I am inputting any numbers it says I have not submitted a passcode so it is not the case of me using the wrong passcode.   

This happens to both me and my colleagues and it happens when we dial in from both our work phones and our mobile so it must be (I guess) an issue with the zoom meetings that we are setting up ???  Any help GREATLY appreciated