Unable to reach Akamai server on WARP

I am trying to reach a particular Akamai server via WARP, but the route seems to be blocked.
For rabobank.nl I am getting the following nameservers:

~> dig rabobank.nl ns +short
a12-64.akam.net.
a1-191.akam.net.
a3-67.akam.net.
a7-64.akam.net.
a20-66.akam.net.
a18-65.akam.net.

I can reach every listed server using WARP, apart from the first one:

~> traceroute a12-64.akam.net.
traceroute to a12-64.akam.net (184.26.160.64), 64 hops max, 52 byte packets
 1  172.16.0.1 (172.16.0.1)  10.797 ms  11.308 ms  11.683 ms
 2  141.101.64.1 (141.101.64.1)  13.730 ms  12.530 ms  13.654 ms
 3  198.41.140.33 (198.41.140.33)  38.324 ms  37.354 ms  29.924 ms
 4  198.41.140.188 (198.41.140.188)  49.784 ms  56.710 ms  58.365 ms
 5  * * *
...

MTR:

Host              Loss%   Snt   Last   Avg  Best  Wrst StDev
 1. 172.16.0.1      0.0%     8   10.4  44.8   9.9 149.2  61.1
 2. 141.101.64.1    0.0%     8   19.0  58.2  19.0 120.9  43.7
 3. 198.41.140.33   0.0%     8   32.0  46.8  29.7  85.5  21.3
 4. 198.41.140.188  0.0%     8   53.6 115.5  52.5 257.8  73.7
 5. (waiting for reply)

Works fine on my home connection:

~> traceroute a12-64.akam.net.
traceroute to a12-64.akam.net. (184.26.160.64), 30 hops max, 60 byte packets
 1  router (192.168.1.1)  0.243 ms  0.294 ms  0.286 ms
 2  xxx (x.x.x.x)  9.650 ms  14.192 ms  15.714 ms
 3  212.142.52.25 (212.142.52.25)  20.554 ms  20.677 ms  20.656 ms
 4  asd-rc0001-cr101-be112-2.core.as33915.net (213.51.7.90)  22.373 ms  22.365 ms  22.376 ms
 5  nl-ams17b-rc1-lag60-2.core.as33915.net (213.51.64.6)  20.448 ms  20.441 ms  20.434 ms
 6  us-was03a-rd1-ae-105-0.aorta.net (84.116.130.66)  114.517 ms  113.927 ms  113.898 ms
 7  us-was03a-ri1-ae-11-0.aorta.net (84.116.130.165)  111.511 ms  100.638 ms  110.175 ms
 8  213-46-190-218.aorta.net (213.46.190.218)  176.200 ms  169.312 ms  173.082 ms
 9  a12-64.akam.net (184.26.160.64)  105.616 ms  106.507 ms  113.723 ms

MTR:

Host                                         Loss%   Snt   Last   Avg  Best  Wrst StDev
 1. router                                     0.0%     8    0.4   0.4   0.3   0.4   0.0
 2. xxx                                        0.0%     8    6.4   9.6   6.4  14.6   2.6
 3. 212.142.52.25                              0.0%     8    9.9  11.3   9.3  17.0   2.3
 4. asd-rc0001-cr101-be112-2.core.as33915.net  0.0%     8   11.4  11.5   9.8  13.3   1.0
 5. nl-ams17b-rc1-lag60-2.core.as33915.net     0.0%     8   11.0  10.2   7.9  12.3   1.5
 6. us-was03a-rd1-ae-105-0.aorta.net           0.0%     8  100.0 104.1  99.7 117.2   5.6
 7. us-was03a-ri1-ae-11-0.aorta.net            0.0%     8  104.7 102.1  99.1 104.7   2.1
 8. (waiting for reply)
 9. a12-64.akam.net                            0.0%     8  102.6 101.1  99.0 103.1   1.3

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