Lync 2013 on Server 2016 meet now not working

Aemilianus Kehler 101 Reputation points

I'm at my wits end.

I setup a whole new topology on a single Standard standalone Lync 2013 server on server 2016 (don't even ask me why still that old instacne and not a newer one, it's a sore subject that'll just trigger me).

I setup everything in a test environment and everything was working. We decided to test it with just a couple of us in IT, and sure enough the one thing I couldn't test (meet now with audio video, since it was all VMs without those hardware), doesn't work.

Yes, I have the latest May 2021 Lync CU installed.

Yes, I've done the Install-CSDatabase to resolve the issue after CU updates.

Yes, I've double checked all Simple URLs are correct.

Yes, I've run Enable-CSComputer.
2 Warnings: WARNING: No patterns found. Skipping rewrite rule creation for Web Scheduler.
Nothing related to meeting/conferencing

Yes, I've checked the Lync Control Panel and all Services are green.

Yes, I've Checked Event viewer, as how I cleaned up all other issues noted from CU update.

Yes, I've enabled verbose logging on the client. Main errors include:

"ERROR :: CRTCCccpDecoder::GetEndpointTypeFromText - unknown session-type:
WARN :: not expecting focus entity in getConference response
ERROR :: CUccOutgoingInviteOperation::Execute: HRESULT API failed: 80ee000b = hr. StartNegotiation on Media Flow failed
ERROR :: CUccPresenceDeviceInstance::ProcessValue - Timezone string is unexpected format (length 0, expected 14). Assuming timezone is GMT
ERROR :: SIP_URL::InternalInitialize Didn't find host while parsing SIP URL []"

The only one that seems relevant is the Media Flow one.

Yes, I've disabled the firewall on both server and client.
Yes, I created a dedicated open firewall rule on the Firewall between client and server.

Client is Skype For Business Office 2013, with all latest patches. 15.0.5233.1000

It makes me feel like a service issue on the FE side, but the logs are 100% clean there... I just can't figure it out! Driving me nuts! HELP!

Skype for Business
Skype for Business
A Microsoft communications service that provides communications capabilities across presence, instant messaging, audio/video calling, and an online meeting experience that includes audio, video, and web conferencing.
602 questions
Windows Server 2016
Windows Server 2016
A Microsoft server operating system that supports enterprise-level management updated to data storage.
2,363 questions
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1 answer

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  1. Sharon Zhao-MSFT 25,051 Reputation points Microsoft Vendor

    @Aemilianus Kehler ,

    You could try the following steps to fix your problem:

    1. Disable conferencing feature in Lync server 2013, Topology Builder as below:
    2. Publish Topology.
    3. Install or Update Skype for Business Server System in Lync server 2013 - Deployment Wizard.
    4. Reenable conferencing feature in Lync server 2013, Topology Builder.
    5. Publish Topology.
    6. Install or Update Skype for Business Server System in Lync server 2013 - Deployment Wizard.
    7. Start services in Lync server 2013 - Deployment Wizard.
    8. Then, test if you can use Meet Now feature.

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