default team auth not configured: No auth methods have been configured.
As described in the release note, "user-based team authentication" feature is introduced in PCF 4.2.1 and requires the manifest changes. For this particular issue, the "user auth" information should be specified in manifest as stated here.
Specify the "user auth" information in mainfest file to deploy Concourse. The following is an example to add a local users "admin1" and "admin2". This is done by running "add_local_users" and "main_team" properties in the manifest file for ATC job.
Note that "$2y$12$CuaU.5Zt9LjJ9iOqZ.PxBuQ4Zvh.tU.vym971iztOQp1MIqPWy/Wm" is the bcrypted string of "changeme".
add_local_users: - admin1:changeme - admin2:$2y$12$CuaU.5Zt9LjJ9iOqZ.PxBuQ4Zvh.tU.vym971iztOQp1MIqPWy/Wm main_team: auth: allow_all_users: true
Deploy Concourse again after the manifest is updated.