To confirm as I understand from the Hot Desking FAQ, Hot Desking is currently not supported when using O365 as your Cloud PBX? This is why Guest is not showing up as an option on my Skype for Business Base Profile? Thanks for the clarification!
welcome back to the Polycom Community.
The community's Skype for Business FAQ contains this post here:
Dec 15, 2017 Question:Do Polycom Phones support Hot Desking?
Resolution: Since 5.7.0 this feature is supported on VVX Business Media phones as shown => here <=
Please ensure you always check the community FAQ and/or utilize the community search before posting any new topics or follow up post’s.
The above FAQ lists this as a current restriction when using Office 365
Polycom Global Services
Aug 09, 2016 Question:Why can Polycom not discuss future software Versions within the Community?
Explanation:Polycom, as a US based company, cannot share any future release dates or new features due the requirement of a non disclosure agreement / NDA prior to this.Via the medium of a community forum we are unable to do this.