Error sign-in to Skype for Business "The server is temporarily - Microsoft Community

office 365 enterprise e3 - skype business online (plan 2)

windows 10 version 1607 (build 14393.187)

skype business 2016 mso (16.0.8229.2073) 32 bits

failure reason: unable acquire personal certificate sign-in skb.

done following can't resolve.

c:\users\%userprofile%\appdata\local\microsoft\office\16.0\lync”> , delete sip_profilename folder.

remove regkey @ hkey_local_machine\software\microsoft\cryptography\machineguid

diagnostic log:

hi cher yee low,

i’d confirm whether referred steps below clear cached credentials , certificates , flush dns.
1. log out of skype business. 
2. delete sign-in info , exit skype business. 

3. open run bar , type in %appdata%. make sure you're in appdata directory , navigate \local\microsoft\office\16.0\lync\ skype business  
4. delete sip_profilename folder. if not see folder, check \local\microsoft\communicator directory. 
5. delete files in tracing folder. not delete folder itself. 
6. clear dns cache: in command prompt run ipconfig /flushdns command.

if not, please try them again , let me know how work. 

meanwhile, checked domain information , noticed it’s federated domain. thus, recommend turn admin verify have trusted root certification authority (ca) installed. if issue persists, i’d collect following information further troubleshooting:
1. when did notice issue? did happen suddenly?
2. issue happen other office 365 users in organization?
3. if log skype business on desktop?

thanks,
sam

Office / Windows 10 / Office 365 for business