Hi @Annemarie Balfour ,
Based on your description, I tested in my Exchange 2013 (CU23) lab and can reproduce this issue. But there's no issue in Exchange 2016 or Exchange 2019, that is, the Working Elsewhere status can show properly in Scheduling Assistant.
Also found the thread below which discusses a similar and according to the information shared there by Allen, this has been confirmed as a known issue in Exchange 2013.
Appointments with option Working Elsewhere not visible for all users
"I reproduce this issue in my lab, and I also double confirm that it's a known issue in Exchange 2013."
Given current situation that the issue still persists in the latest CU23 for Exchange 2013, I personally would like to recommend encouraging the users to choose other status like "tentative" as a workaround.
An alternative I can think of is to configure MailTips for users who are working from home. For example, we can run the command below to create a mailtip for user31:
Set-Mailbox user31 -MailTip "User31 is Working From Home."
Then when user31 is added as a recipient in either a message or a meeting event, the sender will see the mailtip and thus be informed that user31 is currently WFH:
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