Anyone else having IPv6 trouble in the Wichita area?

My router picks up the /128 for its external interface okay:

FastEthernet4          [up/up]
    FE80::B6DE:31FF:FEA2:4BEC
    2600:8803:7F11:300:54BF:ED91:45A5:7F07

...but never receives the /56 prefix; the DHCPv6 client stays in SOLICIT:

FastEthernet4 is in client mode
  Prefix State is SOLICIT (1)
  Information refresh timer expires in 23:43:58
  Address State is OPEN
  Renew for address will be sent in 11:43:58
  List of known servers:
    Reachable via address: FE80::EE1D:8BFF:FE08:6419
    DUID: 00010001561BCA61F8BC123D6028
    Preference: 0
    Configuration parameters:
      IA NA: IA ID 0x00080001, T1 43200, T2 69120
        Address: 2600:8803:7F11:300:54BF:ED91:45A5:7F07/128
                preferred lifetime 86400, valid lifetime 86400
                expires at Apr 21 2018 12:35 PM (85439 seconds)
      DNS server: 2001:578:3F::30
      DNS server: 2001:578:3F:1::30
      Information refresh time: 0
  Prefix name: prefix-from-provider
  Prefix Rapid-Commit: enabled
  Address Rapid-Commit: enabled
  Prefixes sent as hint:
    ::/56

Anyone else seeing the like?

-c