vaultwarden/Disable-invitations.md

Even when registration is disabled, organization administrators or owners can invite users to join organization. After they are invited, they can register with the invited email even if SIGNUPS_ALLOWED is actually set to false. You can disable this functionality completely by setting INVITATIONS_ALLOWED env variable to false:

docker run -d --name bitwarden \
  -e SIGNUPS_ALLOWED=false \
  -e INVITATIONS_ALLOWED=false \
  -v /bw-data/:/data/ \
  -p 80:80 \
  bitwardenrs/server:latest