Free/busy publish at http location does not work

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I followed the Microsoft instruction to configure the Outlook app to publish the Free/busy information, but it seems that it does not work.

In options > Calendar > Free/Busy Options... I added an HTTP resource such as
Outlook makes calls, but these are OPTIONS HTTP requests with, of course, no data.

Creating a file in a shared folder (format file://\\) works.
I do not have an Exchange account connected.

Thank you for your help.
I just finished a hybrid and had same issue with my site, I followed all the documentation from Microsoft but no luck. Finally I restarted the IIS site on the on prem CAS server and it started working.

Might be worth a shot if you haven’t rebooted that server since hybrid was established.
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