Hi @mickaelbeaudry! I'm Dosu and I’m helping the cal.com team.

Managing team members in a self-hosted Cal.com instance is restricted—adding users to teams is a commercial feature and requires a valid license. Without a commercial license, the UI and API endpoints for team member management are blocked, and there’s no admin dashboard or CLI for this in the free self-hosted version. Team/user relationships are modeled in the database using Prisma (User, Team, Membership), but direct database manipulation is risky and not officially supported for this purpose. There’s no official workaround for enabling team management features without a license, and attempts to use these features will trigger license checks and show the “commercial feature” message. More details are discussed here and here.

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That bot response says it all: the ability to create a team is free, but the ability to actually use it by adding members is a commercial feature. This confirms their "open source" self-hosted option is just a deliberately crippled demo to upsell you imho. Especially after already implementing it.