Skype IM Issue

[ITGURU]

I'm intending on deploying skype for business across the site having used it between a few colleagues for a few years.

It's been working fine until installed in onto other computers, and now when the users login they are unable to send messages using the client. It says the organiser disabled IM for this meeting' . They can see the users who are online but when they double click to IM, the chat box opens, cannot write anything, and get the error message.

If users login to my PC it all works fine, however for all other site computers they cannot message.

Is there a GPO or something somewhere causing this issue, as i'm not aware of any that would have been set for Skype.

It's definitely a computer/gpo issue as the computers it works on are not part of the normal policies.

Anyone else had this or know where to look/

thanks.