Instance Pool fails to create when based on Instance Config. that includes Block Vol. attachment

Summary

Instance Pool fails to create when based on Instance Config. that includes Block Vol. attachment

Content

Hello group. I've encountered an error that has me puzzled.  Specifically I am creating an Instance Pool based on an Instance Configuration that includes a Block Volume attachment and continually get error "an internal error had occurred." When I run via OCI Console or OCI CLI the error is the same and non-descriptive. Here is OCI CLI error:

ServiceError:
{
    "code": "InternalError",
    "message": "Internal error occurred",
    "opc-request-id": "326602ADBA166894EF1829D8CD749A2B8B3F823F0B/86AE5458C798A19A48574AB249586/D6357B77AB84C6624741DA5E6",
    "status": 500
}