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If you are using Citrix UPM on 2203 CU2 Citrix forces the OST to the user's AppData\Local\Microsoft\Outlook location. This overrides the group policy setting "Default Location for OST files". Not sure if that's what you are running up against.

I should have updated my post, I found the issue after a bit of googl'ing. I'm upgrading the VDA now. ---- https://support.citrix.com/article/CTX478181/customized-outlook-ost-path-gets-reset-by-upm-during-logon