Hi,
Thanks for your reply. It definitely pointed in the write direction. Not sure which on of these steps fixed the problem but I followed the c# example from this thread: Generate SDK Signature with ASP.NET Core (C#) backend - #9 by allen
I also updated the equivalent to my meeting .js to reflect the changes for version 2.10.1. Most of it looked the same but is working now.
Thanks for your help. Would of been lost without the reply!