I have recently purchased ArcGis for Personal use and my licence is valid. But I am unable to login to Survey123 .
Below is the error http://survey123.arcgis.com/share/common/error?errorCode=webform04
You need an ArcGIS Online subscription account to try Survey123 for ArcGIS.
Kindly help me how to activate survey123.
Are you using named-user licensing with Survey123? If so it looks like you may need to first log into arcgis.com to enable the Survey123 license.
Let me know if this works for you.