@IoT-Arista Hi, thanks for letting us know! We moved our documentation library to docs.iotcreators.com - but I think you figured that out. I will try to figure out if we can change or remove the broken links from google search. Thank you!
If your device has transmitted data it has "auto registered’ to the main account and can not be claimed by any project account anymore. Everyday at approx. 8 AM devices get cleared again from the main account and can be registered again.