Hi Henry,
If you want to change the meeting URL, you could follow Shankar’s method.
Another point, you need to run “Enable-CsComputer” after finishing.
You could refer to the following link for more information.
https://technet.microsoft.com/en-us/library/gg398287%28v=ocs.15%29.aspx?f=255&MSPPError=-2147217396
As you noticed, could you tell me which ‘.html file’ you modified on the server? We could do a test if it is possible.
Based on our experience, if you changed files for external and internal sites, you may need to restart the Lync Server Web Conferencing service “RTCDATAMCU”. You could use the “Services.msc” tool, or the following command in PowerShell: “Restart-Service
RTCDATAMCU”.
Best Regards,
Leon-Lu
TechNet Community Support
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