skype for business 2019 we can't connect to the server for presenting right now

Dears,

Hope you are all doing well, I recently installed the SFB 2019 server in my university with enterprise model as below:

one server SQL 2016 on (Windows 2016 EN)

one server Office online server 2016 on (Windows 2016 EN)

one server SFB 2019 on (Windows 2016 EN)

but unfortunately that I have gotten this error "we can't connect to the server for presenting right now" when I tried to send a document, share whiteboard or sharing a PowerPoint, 

Really appreciate any help