Hi Atekkof,
It's actually different work mechanism when choosing "Present Programs..." and "Present PowerPoint Files...".
Present PowerPoint Files works with WAC while
Present Programs
doesn't.
For your issue, make sure you have
configured the integration successfully:
1). Confirm the Office Web App Server is associated with the FE pool in topology;
2). Make sure you are able to browse the Office Web App server URL associated with FE Pool and there is no certificate error. The URL should be like
https://wac.internaldomain/hosting/discovery/:
If the issue persists, check the following:
1. Make sure the port 443 is open from WAC to FE IP;
2. Run Get-OfficeWebAppsMachines, confirm if it returns a healthy state.
3. Run Get-OfficeWebAppsFarm, check the internal URL, see if it's identical to the one in the Lync topology for the OWA server.
Meanwhile, here is an valuable blog about WAC and Lync server work flow & troubleshooting, for your reference:
https://blogs.technet.microsoft.com/praj/2015/04/14/troubleshooting-office-web-app-server-integration-with-lync-server-2013/
BR,
Jessie
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