Google Analytics - WordPress: Troubleshoot GA Segment of logged-in WP visitors

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Google Analytics - WordPress: Troubleshoot GA Segment of logged-in WP visitors
We have a single WordPress Instance which serves 2 unique audiences. A subsection of the site (about 30 pages/posts) is only accessible to visitors that authenticate (via SSO) with a client-hosted Identity server...when a visitor successfully logs in with SSO our WP instance creates a user account for them, and assigns them to custom roles that we have created. NOTE: the users do not see/know that they have logged into our WP instance (all admin controls are hidden for them).
We need to filter all of our Google Analytics Data by these two groups logged-in users -vs- public visitors. We already have GA Universtal Tracking GTM with lots of custom-event tracking in place on the site...all of this is being filtered into (1) single [login to view URL] Analytics Dashboard that we provide to our client each month.
We have this segment created already, it has been active for over a year. Recently - the segment stopped reporting.
looking for someone to help troubleshoot/restore this customization.
I can see that we have a Logged-In Trigger in GTM, and that event - is making its way into our GA dashboard as a custom Logged-In Segment.
Not sure what went wrong here, or how to restore.
Skills:
WordPress
, Google Analytics
, PHP
, HTML
, MySQL

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