ArcGIS Online does not properly format URLs with spaces into hyperlinks in pop-ups.
Last Published: November 11, 2014ArcGIS for Server
Bug ID Number
October 9, 2014
April 21, 2023
ArcGIS for Server
After review by the development team, it has been determined that this issue is related to a known limitation with the software that lies outside of Esri's control. The issue's Additional Information section may contain further explanation.
When we have hyperlinks with spaces, the parser does not know if that is a complete URL or URL +space and then a word. So it just displays it as text