In this case, we recommend you try to check your status settings manually in Skype for Business client.
To complete it, you need to click the gear icon in Skype for Business and select “Personal”, then select “Microsoft Exchange or Microsoft Outlook" in the "Personal Information Manager" dropdown and click the checkbox for “Update my presence based on my calendar information”.
In addition, please try to click the “reset status” to see if this issue can be fixed.
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