The activation link in ArcGIS for Developers does not indicate users cannot activate the account with an existing public account.
Last Published: January 21, 2015ArcGIS Online
Bug ID Number
BUG-000084288
Submitted
December 30, 2014
Last Modified
July 8, 2022
Applies to
ArcGIS Online
Version found
N/A
Status
In Product Plan
The issue has been added to the development team's backlog. The goal for issues with this status is to address them in a near-term release (next release or two). Check the issue's Additional Information or Alternate Solution section to see if there is helpful information until it can be fully addressed.
Workaround
Create a new account when activating a trial account.