Changes since SOA version
IXFR is a zone transfer request that returns changes since a specific SOA version. Enter the SOA version to request changes since then.
Not an apex domain
The domain 477b21a6-727e-413f-b5b8-cd0f27c02b6b.tenant.runtime.msappproxy.net is not the root of its zone.
Instead, try zone transfer on trafficmanager.net .
Instead, try zone transfer on trafficmanager.net .