Onboarding Report: Qrevo S Pro (failed)

[Hexygo]

Hello, I have tried to onboard my Qrevo S Pro and failed on the onboarding. zerossl chain was used, this is the output on the GUI:

Waiting for onboarding traffic from the selected vacuum. If this never changes, confirm cloud import is done and the vacuum can resolve and trust your api- hostname.
Sending cfgwifi onboarding packet to 192.168.8.1...
HELLO: no response
Onboarding send failed. Are you joined to the vacuum's Wi-Fi?
Status for Qrevo S Pro Series: samples=0, public_key=False, connected=False, state=missing
Waiting for onboarding traffic from the selected vacuum. If this never changes, confirm cloud import is done and the vacuum can resolve and trust your api- hostname.
Sending cfgwifi onboarding packet to 192.168.8.1...
HELLO: no response
Onboarding send failed. Are you joined to the vacuum's Wi-Fi?
Status for Qrevo S Pro Series: samples=0, public_key=False, connected=False, state=missing
Waiting for onboarding traffic from the selected vacuum. If this never changes, confirm cloud import is done and the vacuum can resolve and trust your api- hostname.
Sending cfgwifi onboarding packet to 192.168.8.1...
HELLO: no response
Onboarding send failed. Are you joined to the vacuum's Wi-Fi?

I tried to ping 192.168.8.1 when connected to the roborock wifi, and the request works. The /admin dashboard is correctly reachable with HTTPS certificates from my domain on my local network, and nslookup gives the following output (domain redacted):

nslookup api-rr.[domain]
Server:         192.168.1.176
Address:        192.168.1.176#53

Non-authoritative answer:
Name:   api-rr.[domain]
Address: 192.168.1.13

Please let me know if i can try anything else!

[Hexygo]

Forgot to mention, the firmware version was v02.36.38