To be able to use deployment webhooks to push a meaningful notification into Teams/Slack the deployment project name is needed. Weirdly this variable has been omitted.

Everything else comes with .id and .name variants except the project.

As per Using webhooks - Atlassian Documentation

${bamboo.webhook.template.id} - ${bamboo.webhook.template.name}
${bamboo.deploy.environment.id} - ${bamboo.deploy.environment.name}
${bamboo.deploy.version.id} - ${bamboo.deploy.version.name}
${bamboo.deploy.project.id} - missing

Please provide a bamboo.deploy.project.name variable.