There is no contact name when I click meeting attendance.
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Sorry you're stuck but there's almost always a pretty easy fix! Do NOT try to start all over again, uninstall Max's Pitch Package, etc. That can make it worse. There's a 95% chance the same snag/fix is listed & answered in the Help FAQ. But if you can't find it there, post your problem here.
Make sure you post in the right category below & be sure to include a screencap showing the issue!
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It looks like, when you were creating the Meeting Attendance object, you connected it to itself rather than to Meeting (Steps 78-82). Now go back to Setup > Object Manager > Meeting Attendance and Fields and Relationships and then delete the Meeting ID field and then create it again using Steps 78-82 but follow instructions carefully this time. Then Step 99 will work.