That's completely wrong.
Your dns AAAA entry has nothing to do with your local installation (Windows / Linux / other system, Kernel version, Kernel supports ipv6 or not etc.).
Rechecked your domain - https://check-your-website.server-daten.de/?q=ingber.com
Now your ipv4 and ipv6 works:
| Domainname | Http-Status | redirect | Sec. | G |
|---|---|---|---|---|
| • http://ingber.com/ 173.255.212.226 | 302 | https://ingber.com/ Html is minified: 100,00 % | 0.343 | A |
| • http://ingber.com/ 2600:3c01::f03c:91ff:fe93:e6f3 | 302 | https://ingber.com/ Html is minified: 100,00 % | 0.330 | A |
| • http://www.ingber.com/ 173.255.212.226 | 302 | https://www.ingber.com/ Html is minified: 100,00 % | 0.344 | A |
| • http://www.ingber.com/ 2600:3c01::f03c:91ff:fe93:e6f3 | 302 | https://www.ingber.com/ Html is minified: 100,00 % | 0.330 | A |
| • https://ingber.com/ 173.255.212.226 | 302 | https://www.ingber.com/ Html is minified: 100,00 % | 4.420 | B |
| • https://ingber.com/ 2600:3c01::f03c:91ff:fe93:e6f3 | 302 | https://www.ingber.com/ Html is minified: 100,00 % | 3.810 | B |
| • https://www.ingber.com/ 173.255.212.226 GZip used - 25230 / 126527 - 80,06 % Inline-JavaScript (∑/total): 3/709 Inline-CSS (∑/total): 1/542 | 200 | Html is minified: 113,24 % | 4.360 | B |
| • https://www.ingber.com/ 2600:3c01::f03c:91ff:fe93:e6f3 GZip used - 25230 / 126527 - 80,06 % Inline-JavaScript (∑/total): 3/709 Inline-CSS (∑/total): 1/542 | 200 | Html is minified: 113,24 % | 4.047 | B |
Now not a Timeout (Grade T), instead a good Grade B.
You see: Ipv6 answers and has the same result as ipv4.