'Generate Service Areas' is deprecated here but suggests no alternative.
@CassandraFollett All of the Network Analysis tools in the Ready To Use Tools gallery were deprecated at ArcGIS Pro 3.0. Users in ArcGIS Pro 3.0 can carry out Network Analysis workflows from the Network Analysis gallery found on the Analysis tab. Review details and tutorials.
It's still not clear to me what the equivalent tool is to "Generate Services Areas". That tool created something useful and it was simple to use and understand. I feed it a point layer, some intervals and it outputs polygons showing the regions that can be reached in those drive time intervals. The inputs are one layer and a list of times.