After the implementations in a PRE-DEV server which is working fine, we did all the same process in the DEV Server. But after checking the configurations with differents people and many times we keep having an error message.
The Steps are:
1) Open ACC Client and connect using Adobe ID
2) Specified credentials (Adobe ID user has Admin Role for the ACC platform in Marketing Cloud)
3) A message with an error appears “Error during IMS authentication”.