"Couldn't load environments or environment families. Refresh to try again"

I have a policy that allows some people in a group to schedule Fusion environment refreshes that looks like this:

Allow group '<mygroup>' to read fusion-family in compartment <mycompartment>
Allow group '<mygroup>' to manage fusion-refresh-activity in compartment <mycompartment>

I created that based on the documentation found here: https://docs.public.content.oci.oraclecloud.com/en-us/iaas/Content/fusion-applications/iam-policies.htm

This was working fine and the person assigned to <mygroup> has been able to schedule refreshes. But today, they are getting an error when they click the "Refresh" button:

If they click the "Refresh" button, they just get a blank page.