Can't join event

Hi I have tried to join 3 Baseline TT sessions but never get the join invite. I have managed to join other events. Please can someone help me resolve this. Any ideas of what is wrong?

HI are you using the Zwift app ?

I am using my Windows 10 lap top connected to the tv and I also have the companion app open. I have been able to join other races but never this TT. The JOIN button does not appear on either my laptop or the app like it does with other races. Thanks for taking the time to help.