Update Group Supervisors from REST API

I am trying to make some adjustments to our ServiceNow integration with xMatters. Based on the documentation from the API docs, it shows that supervisors is an accepted field for modification and that it accepts, what looks like an array of strings but this doesn't seem to make sense although I have tried that along with a simple string.

This request ultimately fails and doesn't seem to like this field for supervisors. Any tips on how to make this POST request with a custom supervisor?


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