Ask HN: Apple Cannot Call Me (Twilio?) 976?

I'm applying for the Apple Developer Program; I've just got a DUNS number.

DUNS had issues contacting my main company phone number; it's an 855 number. We were able to power through it when I called them back from my mobile.

Now, Apple also cannot place calls to my 855 number. Of course I can call Apple but when they try to dial that number there is no connection.

My telephone number is hosted in Twilio; anyone else had issues with Apple calling Twilio?

My 855 number has the prefix 976 in it. Historically 976 was a toll prefix. Maybe that is blocking (via toll-restricted dial on the PBX) DNB & Apple phone systems?