I have created a copilot with custom instructions provided at creation. But afterwards I can no longer edit those instructions. The interface says "AI features aren't enabled, so any instructions won't apply" and the field is greyed out. But AI features are clearly enabled (see screenshot below).
If the environments list is empty that means you aren't a Power Platform Admin. You'll need to talk to one of your admins to check that setting. But copilots in copilot studio all run in an environment. A default environment if nothing else. So there must be environments. You simply don't have enough rights to administer them.
Check the settings of the Environment in the Power Platform Admin center. Depending on your region you may need to enable Move Data Across Regions under Generative AI to use Azure Open AI Service in another region.
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