The user provided the real, dedicated Slack destination for this
automation (a separate Bot app credential + its channel), correcting my
earlier inference (the shared "Slack account" credential + $vars.
SLACK_CHANNEL_TECNICO, borrowed from an unrelated archived workflow,
which Slack's own API rejected as invalid_arguments in the prior test).
Created a new slackApi credential ("Slack - Bot Coordenador (Chamados
Suporte)", id lNqwBBrtLfkRqw2X) via n8n_manage_credentials -- the token
was created directly through the n8n credentials API and never written
to any file, workflow parameter, or commit; only the credential's id/name
reference (not a secret) is stored in the workflow, same as every other
credential in this project. Slack - Enviar Mensagem now targets channel
"CHAMADOS SUPORTE" by name instead of the unresolved variable.
158/158 tests passing.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>