@BernSzukalski In the November update of ArcGIS Online (What's New in ArcGIS Online (November 2022) (esri.com)), support for showing related records in pop-ups was enabled for the new map viewer, but only for hosted services :(. This is a big issue for us, as most of the projects I work on use Server services, and we cannot migrate to the new map viewer until this feature is supported. I can't seem to find any info on the road map for this so was wondering if anyone knows when/if related records in pop-ups will be supported for Server services. Thanks!