Managing Slack Apps

Every now and then, employees create apps that do important stuff/automations and then leave the company.

When they leave the company, it's a nightmare because that app cannot be managed given they were the only collaborators.

Slack says here that it is possible to add a collaborator to a Slack app. But that guide is a dead end. For context, I am on the Business+ plan and a Workspace Owner.

TLDR: I cannot add collaborators to Slack Apps even though I have the Business+ plan and I'm a Workspace Owner (which contracts this official guide). For Slack Workflows, I can easily add people as collaborators.