NoMultiTenantSupport
Andromeda answers 501 with the problem type https://uri.etsi.org/ngsi-ld/errors/NoMultiTenantSupport. The broker runs with tenancy.mode = "disabled", so only the default tenant exists, and a request that names a tenant in the NGSILD-Tenant header is refused. The specification defines this type and binds it to 501.
When this comes back
Any request that carries NGSILD-Tenant while tenancy is off. Leave the header out to use the default tenant, or turn tenancy on.