[outages] Verizon/Azure communication issue

I tried posting this to nanog but my messages always get held for moderation. Possibly this list is more appropriate? We have a customer on Fios who (as far as I can tell) can't reach any IP announced by Microsoft. I tried calling both NOCs listed on PeeringDB but Verizon's number didn't work and the Microsoft guy hung up on me. Is there anyone here who has a better contact at either group? Note: It's not a Fios-wide problem, as my office is also on Fios and can reach the IPs fine. It's just 0.ae13.gw9.iad8.alter.net [140.222.236.139] that seems to be having a problem. Thanks, Ross