Error 503 (failing to connect to quic.cloud with domain key)

hello, i am trying for a while to connect both quic.cloud and cloudfler but when i am asking for the domain key in wordpress for the quic.cloud its dont work. i emaild them and they told me i have 503 error and the Cloudflare nameserver on it. what i am sepposed to do exactley?
this is what they sent me:

" HTTP/1.1 503 Service Temporarily Unavailable Date: Tue, 11 Oct 2022 16:26:39 GMT Content-Type: text/html; charset=UTF-8 Transfer-Encoding: chunked Connection: close X-Frame-Options: SAMEORIGIN Referer-Policy: same-origin Cross-Origin-Embedder-Policy: require-corp Cross-Origin-Opener-Policy: same-origin Cross-Origin-Resource-Policy: same-origin Permissions-Policy: accelerometer=(),autoplay=(),camera=(),clipboard-read=(),clipboard-write=(),fullscreen=(),geolocation=(),gyroscope=(),hid=(),interest-cohort=(),magnetometer=(),microphone=(),payment=(),publickey-credentials-get=(),screen-wake-lock=(),serial=(),sync-xhr=(),usb=() Cache-Control: private, max-age=0, no-store, no-cache, must-revalidate, post-check=0, pre-check=0 Expires: Thu, 01 Jan 1970 00:00:01 GMT Report-To: {"endpoints":[{"url":"https:\/\/[a.nel.cloudflare.com](http://a.nel.cloudflare.com/)\/report\/v3?s=uRJN5P6r2aru29EJ2WE%2FxoJ2mq3vZ5myksOOp0LE8Z0iToRzUJdw2hoo7njb5Vy2QyklXShSF47929TWgqNVQiEqRx93JqnWhO9U4EAOdclwk%2F35%2BY0EQBvxedbxmXNy6LU%3D"}],"group":"cf-nel","max_age":604800} NEL: {"success_fraction":0,"report_to":"cf-nel","max_age":604800} Server: cloudflare CF-RAY: 7588f56d7ec09c85-IAD alt-svc: h3=":443"; ma=86400, h3-29=":443"; ma=86400"