Hi,
When you accept or decline an invitation received in Microsoft Outlook, an invitation email will usually disappear because of the settings. To join Skype for Business conference call meeting, you can use at least the following two options:
The first option is to click on
calendar icon in Skype for Business, to show today's scheduled conference call meetings and choose to join the relevant one:
The second option is to click on
calendar icon in Outlook, to show the scheduled meetings and open the required one:
Then join the meeting by clicking on the following
link: