Date: 202101
Local time of day: 1201-1800
Location: ZZZ.Airport, US
Aircraft: Commercial Fixed Wing
Operator: Air Carrier
Operating under: Part 121
Flight plan: IFR
Mission: Passenger
Flight phase: Other ALL
Airspace: Class A ZZZ1
ATC / advisory: Tower ZZZ
Reporter organization: Air Carrier
Reporter function: First Officer; Pilot Not Flying
Reporter qualification: Flight Crew Air Transport Pilot (ATP); Flight Crew Instrument; Flight Crew Multiengine
Human factors: Confusion; Distraction; Situational Awareness; Time Pressure; Workload
Anomaly: ATC Issue All Types; Deviation / Discrepancy - Procedural Clearance; Deviation / Discrepancy - Procedural FAR; Deviation / Discrepancy - Procedural Published Material / Policy
Detector: Person Air Traffic Control; Person Flight Crew
When detected: In-flight
Result: Air Traffic Control Provided Assistance; Flight Crew Returned To Clearance
Contributing factors: Human Factors; Environment - Non Weather Related; Airspace Structure; ATC Equipment / Nav Facility / Buildings; Procedure
Primary problem: Environment - Non Weather Related

Narrative: Just prior to pushback we were notified of a ZZZ1 Center closure.  We delayed push and notified Dispatch.  We were filed a new route; which avoided ZZZ1 Center; got more fuel and a new release. Our CPDLC was as filed.  We then received a re-route via CPDLC and it was within about 30 NM of our previous route; checked fuel and pushed.As we proceeded south toward ZZZ [VOR] I queried ATC about our re-route.  I emphasized that we had filed for a route that avoids ZZZ1 Center and was told they would call 'upstairs' and see what was going on.  We were told that the X area route was unavailable.  When we turned east toward ZZZZZ [Intersection] I queried the next Controller about our routing and; after making a phone call; I was told the area X route was unavailable and they had a plan to get us to ZZZ1 [airport] via our current routing.As we neared ZZZZZ [Intersection]; I again queried the Controller about what the 'plan' was.  He said that ZZZ1 Center was going 'Zero' at XA:X0z. So now I thought we would be holding.  We were then handed off to ZZZ2 Center and they said they had a plan for us.  They gave us a left vector and I asked about holding.  ZZZ2 [Center] said that if we could go down to FL220 they could get us in.  We said we could do that and were cleared FL220 direct to ZZZZZ [Intersection] and give a ZZZZZ1 [Intersection] estimate; which we did.After turning south over ZZZZZ [Intersection]; ZZZ2 Center told us 'Radar service terminated' and contact ZZZ3 Center.  Somewhere between ZZZZZ [Intersection] and ZZZZZ1 [Intersection] we received a dispatch ACARS that we were not allowed to accept this routing. While the Captain was trying to coordinate with Dispatch I made an unrequired position report to ZZZ3 Center just to see if they could hear us and they acknowledged.The Captain told me that Dispatch wanted us to divert to ZZZ2 [airport] and was getting us numbers.  After a failed attempt to reach dispatch on ARINC we discussed the option of diverting to ZZZ2 [airport].  At this point we were about 80nm from ZZZZZ1 [Intersection] and decided that it was more prudent to continue to destination than to try to reverse course in a non-radar environment.  We checked in with ZZZ3 Center at ZZZZZ1 [Intersection] and the rest of the flight was uneventful.




Synopsis: Air carrier First Officer reported that the planned route to avoid ATC Zero airspace became unavailable and ATC provided a new route which resulted in the flight being in a non-radar environment. First Officer stated that they were later informed by company that they were not allowed to accept such a route.