BBnewbee

Hello, Can anyone help with an issue regarding a problem when registering for an ACLB virtual club tournament? I have played in lots and never had a problem BUT lately when I invite my partner I get a message that they are not online - and they are. If we try it so that they invite me the same thing happens. Not all the time but enough to be annoying and if there is a simple fix can someone let me in on it? Many thanks