IP possibly blocklisted?

I managed to get the diag report to work by hardcoding the IP for nextdns.io in my /etc/hosts file, but it failed to post, so here's the text:

Resolvers:  192.168.2.1
Testing IPv6 connectivity
  available: false
Fetching https://test.nextdns.io
  Fetch error: Get "https://test.nextdns.io": dial tcp 188.172.221.9:443: i/o timeout
Fetching PoP name for ultra low latency primary IPv4 (ipv4.dns1.nextdns.io)
  edis-ymq: 26.341ms
Fetching PoP name for ultra low latency secondary IPv4 (ipv4.dns2.nextdns.io)
  zepto-ymq: 27.721ms
Fetching PoP name for anycast primary IPv4 (45.90.28.0)
Fetch error: Get "https://dns.nextdns.io/info": dial tcp 45.90.28.0:443: connect: operation timed out
Fetching PoP name for anycast secondary IPv4 (45.90.30.0)
Fetch error: Get "https://dns.nextdns.io/info": dial tcp 45.90.30.0:443: connect: operation timed out
Pinging PoPs
  vultr-chi: 23.84ms
  zepto-ymq: 30.138ms
  edis-ymq: 28.992ms
  anexia-chi: 35.91ms
  teraswitch-pit: 35.592ms
  incx-dtw: 41.858ms
  zepto-iad: 41.933ms
  router-pit: 79.873ms
Traceroute for ultra low latency primary IPv4 (92.243.64.136)
    1    192.168.2.1    1ms   0ms   0ms
    2   198.2.98.193   13ms  15ms  14ms
    3  104.153.24.70   14ms  13ms  13ms
    4  104.153.24.69   17ms  22ms  20ms
    5 64.140.112.173   16ms  15ms  21ms
    6 64.140.112.172   23ms  24ms  23ms
    7 64.140.112.176   23ms  18ms  18ms
    8 64.140.112.189   22ms  20ms  21ms
    9  38.122.69.129   22ms  21ms  21ms
   10   154.54.42.90   31ms  28ms  48ms
   11  154.54.45.118   55ms  37ms  26ms
   12 38.104.154.234   27ms  27ms  34ms
   13 77.243.185.220   38ms  45ms  38ms
   14  92.243.64.136   25ms  25ms  27ms
Traceroute for ultra low latency secondary IPv4 (86.106.90.57)
    1    192.168.2.1    0ms   0ms   0ms
    2   198.2.98.193   11ms  10ms  10ms
    3  104.153.24.70   15ms  14ms  23ms
    4  104.153.24.69   34ms  15ms  18ms
    5 64.140.112.173   17ms  18ms  17ms
    6 64.140.112.172   26ms  15ms  17ms
    7 64.140.112.168   18ms  16ms  16ms
    8 64.140.112.152   21ms  18ms  17ms
    9 64.140.112.117   20ms  19ms  17ms
   10  216.66.14.129    *     *    21ms
   11 184.104.197.33   26ms   *     *
   12  198.179.18.86   27ms  27ms  25ms
   13 77.243.185.220   38ms  44ms  28ms
   14  193.9.115.223   25ms  28ms  32ms
   15  45.11.107.159   24ms  26ms  26ms
   16   86.106.90.57   27ms  26ms  29ms
Traceroute for anycast primary IPv4 (45.90.28.0)
    1    192.168.2.1    0ms   0ms   0ms
    2   198.2.98.193   12ms  23ms 121ms
    3  104.153.24.70   14ms  20ms  15ms
    4  104.153.26.69   19ms  16ms  25ms
    5 64.140.112.173   19ms  20ms  19ms
    6 64.140.112.172   16ms  24ms  24ms
    7 64.140.112.168   18ms  15ms  15ms
    8 64.140.112.152   15ms  20ms  16ms
    9 64.140.112.117   24ms  22ms  20ms
   10 206.108.35.117   17ms  18ms  25ms
   11     10.83.0.66   20ms  21ms  20ms
   12     10.83.0.42   17ms  19ms  18ms
   13                   *     *     *
   14                   *     *     *
   15                   *     *     *
   16                   *     *     *
   17                   *     *     *
   18                   *     *     *
   19                   *     *     *
   20                   *     *     *
Traceroute for anycast secondary IPv4 (45.90.30.0)
    1    192.168.2.1    0ms   0ms   0ms
    2   198.2.98.193   10ms  10ms  10ms
    3  104.153.24.70   15ms  20ms  14ms
    4  104.153.26.69   25ms  30ms  16ms
    5 64.140.112.173   16ms  16ms  87ms
    6 64.140.112.172   39ms  21ms  59ms
    7 64.140.112.168   41ms  22ms  19ms
    8 64.140.112.152   18ms  18ms  14ms
    9 64.140.112.117   19ms  21ms  19ms
   10  206.108.35.71   17ms  19ms  20ms
   11                   *     *     *
   12                   *     *     *
   13                   *     *     *
   14                   *     *     *
   15                   *     *     *
   16                   *     *     *
   17                   *     *     *
   18                   *     *     *
   19                   *     *     *
   20                   *     *     *
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Optional email in case we need additional info:
Post unsuccessful: status 400
{"error":"0: instance.Test requires property \"Client\"\n"}

Looks like a little bit of time in the penalty box was all it needed. I guess this can be closed.