If an organization authorizes you to do a specific task, even if you don't work for them directly, you are working under their auspices. Auspices means endorsement.

If student volunteers are helping out with disaster relief under the auspices of the Red Cross, they may be registered with the Red Cross or be using their supplies and equipment. The Red Cross is not responsible for them as they would be for their own employees, but they have given the students their blessing.

Definitions of auspices
  1. noun
    kindly endorsement and guidance
    “the tournament was held under the auspices of the city council”
    synonyms: aegis, egis, protection
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    type of:
    endorsement, indorsement
    the act of endorsing
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