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<p class="no-margin"> It's related to the bug in the [https://github.com/sabre-io/dav/issues/1244 library which Baikal calendar is using].<br> <br> [https://github.com/sabre-io/dav/issues/1244#issuecomment-582607462 See this workaround for more details on how to fix this issue.]<br> <br> Setting the <code>$allowUnauthenticatedAccess</code> property of <code>DAVACL\Plugin</code> to <code>false</code> in your Baikal instance fixes the issue. </p>

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