Unless the manufacturer of the phone releases a firmware update - it doesn't sound resolvable. It sounds like the phone is not compatible with Android Enterprise enrollment.
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@davidson2020 I think the thread you are looking for might be https://community.meraki.com/t5/Endpoint-Management-Systems/Anyone-else-seeing-Unverified-Certificates/m-p/62026#M5509 Maybe that shouldn't effect is at play.
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