
Hi @Sean L,
Thank you for posting in this community.
I discussed your issue with my colleagues on the Outlook team, but we regret to inform you that for the time being there is no out-of-the-box way in SharePoint and Outlook to be able to sync events which contains the phrase "PTO" in the subject to the SharePoint list calendar.
Perhaps Power Automate can create a workflow to accomplish your needs. So I suggest you go to this Power Automate Community and ask the experts for more help.
We apologize for any inconvenience this may cause. Thank you for your kind understanding.
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