Problem

Error at the startup of the Discovery and Traceability agents with the following entries shown in the log:

    "error","message":"API Manager - FAIL (API Manager Failed. Error sending request to V7: status code 403. Check API Manager configuration for AUTH_USERNAME and AUTH_PASSWORD)","time":"2022-07-18T09:53:13+02:00"

The password present in the following files da_env_vars.env and ta_env_vars.env is:
APIMANAGER_AUTH_USERNAME=apiadmin
APIMANAGER_AUTH_PASSWORD=AXway<;AXWay

Resolution

Issue is caused by the fact that the ASCII character "<" is present in API Manager password.

After adding the quotation marks at the start and the end of the password, the issue has been solved:
APIMANAGER_AUTH_USERNAME=apiadmin
APIMANAGER_AUTH_PASSWORD="AXway<;AXWay"