Slack are deprecating legacy tokens, and will not allow generation of legacy tokens from 5th May 2020. https://api.slack.com/changelog/2020-02-legacy-test-token-creation-to-retire
Slack are deprecating legacy tokens, and will not allow generation of legacy tokens from 5th May 2020.
https://api.slack.com/changelog/2020-02-legacy-test-token-creation-to-retire