We have been in contact with appear.in and unfortunately they no longer support the API calls we need to make this integration work.
We are looking into replacing the video feature in Podio with another provider in the future. Would be interested to hear if you know another video chat solution that you would like to see us integrate with?
The recommendation currently from appear.in is to create an account and room, and then paste the direct link in the meeting subject or the meeting description. You can create a FREE account at https://appear.in/user/signup, and if you want to upgrade to PRO we have received the coupon code PODIO - this will give you 50% discount for 2 months.
Thanks for letting us know.
Sara - Podio