You don't "have a sign in to developers.arcgis.com or developers.maps.arcgis.com" -- You use developers.arcgis.com to create your own personal Org, e.g. "della.maps.arcgis.com". Ignore any appearance of being able to be signed in at developers.arcgis.com ... it is not an Org, and it recognizes anyone visiting while being signed in to {{anywhere including just www}}.arcgis.com.
If you're not sure of your username, do this:
- Go to https://www.arcgis.com/home/troubleshoot.html and enter your email address (you should do this with each email address you might have used). Within a minute, the system will email back to that address a list of all ArcGIS Online usernames attached to that email, whether 1 or 100. If the email doesn't show in 5 minutes, check your spam filters, where it could have been caught. If there's clearly no email and nothing in spam filters (you may have district and school filters as well as personal ones), it's good to try it a second time.
If you know your login, but a login/password combo doesn't work, it's likely because the password (which is case sensitive and must be exact) may have been mis-typed, or mis-remembered, or mis-entered originally … I've done all three! So, if it didn't work, here's what you do:
- Go to https://www.arcgis.com/home/troubleshoot.html and enter your username and request a password reset. Within 5 minutes (sometimes within 1 minute) an email will go to your email address with a link.
- If the email with the link arrives, you must access that email and click on that link, which will force you to type in --twice-- a new password (which must be at least 8 alphanumeric characters with at least 1 letter and at least 1 number).
