Unable to select time slot for scheduling because of Calendar Error for some users

[balvinder294]

Issue

When the user schedules an event. It gets created fine. But during slot selection, in some cases for the user there is a warning as below:
"Calendar not found. Please check each permission and correctness of calendar id. Please contact support"

Also, attaching the image of the error.

As you can see the error. This comes only to some users, not all. Everything works well for all users, except some.

So seems like no issue in kloudless window, but maybe backend libraries. Any idea or help what could be the issue?

Thanks

Libraries and Version.

Using kloudless via script

<script type="text/javascript" src="https://static-cdn.kloudless.com/p/platform/sdk/kloudless.scheduler.js"></script>

Angular version 10.x