HTTP 503 Errors found in Setup Wizzard using together with claudflare

Dear support team,

I’m trying to use your plugin to speed up my woocommerce shop pageload, but I am running into problems right in the beginning while checking with the plugin setup wizzard.

I need your help to solve these issues to be able to proceed with your plugin.

For data security I’ve changed entries to MY-DOMAIN

Checking state and compatibility with other themes and plugins: Warning
Images' auto-redirection to 'webp' is not active. Please, find how to enable it or just turn off the Compression: Enable WebP with quality option.
Checking asynchronous tasks execution: Failed
HTTP 503 https://MY-DOMAIN/wp-cron.php?seraph_accel_asynctask=1&_=16614169865545
Response headers
date: Thu, 25 Aug 2022 08:43:06 GMT
content-type: text/html; charset=UTF-8
x-frame-options: SAMEORIGIN
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
expect-ct: max-age=604800, report-uri="https://report-uri.cloudflare.com/cdn-cgi/beacon/expect-ct"
report-to: {"endpoints":[{"url":"https:\/\/a.nel.cloudflare.com\/report\/v3?s=Kn8thRcXdXyy5iiUjG%2FSdFR80FiIvkFoUrEr3Gc50WMSssRSnMNicJFqACp9TU%2BbCDDtNU7vuxCoqYXrLBRS7C6e3q6cAyLIXoK33oELfsUE0QQzhOvz5aSK99JoJ0i0zkHn5UVqbjri0GGplg%3D%3D"}],"group":"cf-nel","max_age":604800}
nel: {"success_fraction":0,"report_to":"cf-nel","max_age":604800}
vary: Accept-Encoding
server: cloudflare
cf-ray: 740309c61de19b34-FRA
alt-svc: h3=":443"; ma=86400, h3-29=":443"; ma=86400
Checking maximum execution time: Succeeded
Checking page optimization requests: Failed
HTTP 503 https://MY-DOMAIN?seraph_accel_prep=eyJub25jZSI6ImU5OTQ2ZWQ1YTdkMjAxOTA5NzdlZGYwNWRiMjMxMDk5Iiwic2VsZlRlc3QiOnRydWUsIl90bSI6IjE2NjE0MTY5OTEuNjE5In0%3D
Response headers
date: Thu, 25 Aug 2022 08:43:11 GMT
content-type: text/html; charset=UTF-8
x-frame-options: SAMEORIGIN
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
expect-ct: max-age=604800, report-uri="https://report-uri.cloudflare.com/cdn-cgi/beacon/expect-ct"
report-to: {"endpoints":[{"url":"https:\/\/a.nel.cloudflare.com\/report\/v3?s=NOIpAqlj9QV6xg1HKzEljcyirI9cyTvmLZRaQYPHMc372Uz%2BFwRM%2BA6uD9emdhPdDwSQRjsnM4KV3fR7EFLrvCE5lr5FUQratA0vXcTTVMkU7hIkl3mcZk5fOt2EScptGMqdHbqp3DEZjLPzGg%3D%3D"}],"group":"cf-nel","max_age":604800}
nel: {"success_fraction":0,"report_to":"cf-nel","max_age":604800}
vary: Accept-Encoding
server: cloudflare
cf-ray: 740309e5be139b88-FRA
alt-svc: h3=":443"; ma=86400, h3-29=":443"; ma=86400
Checking pages external non-static caching: Failed
HTTP 503 https://MY-DOMAIN
Response headers
date: Thu, 25 Aug 2022 08:43:14 GMT
content-type: text/html; charset=UTF-8
x-frame-options: SAMEORIGIN
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
expect-ct: max-age=604800, report-uri="https://report-uri.cloudflare.com/cdn-cgi/beacon/expect-ct"
report-to: {"endpoints":[{"url":"https:\/\/a.nel.cloudflare.com\/report\/v3?s=HeehwSgOoct6abynW1BdRhRYo%2FW6gw%2FCAi5jis2P4dX5YUVXawo7RhjdgKQSz8K6ZbN7Kjyi4f5iNFVaMuKaudQ3d%2FK689EJDM5sS7DY4%2F1yt7IdNEb8ThIcK1iB1vcDaEy0FdZPVJJ7ZHdf7w%3D%3D"}],"group":"cf-nel","max_age":604800}
nel: {"success_fraction":0,"report_to":"cf-nel","max_age":604800}
vary: Accept-Encoding
server: cloudflare
cf-ray: 740309f65f2b921f-FRA
alt-svc: h3=":443"; ma=86400, h3-29=":443"; ma=86400
Checking the task scheduler (Cron) for execution: Failed
HTTP 503 https://MY-DOMAIN/wp-cron.php?_=16614169968824
Response headers
date: Thu, 25 Aug 2022 08:43:16 GMT
content-type: text/html; charset=UTF-8
x-frame-options: SAMEORIGIN
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
expect-ct: max-age=604800, report-uri="https://report-uri.cloudflare.com/cdn-cgi/beacon/expect-ct"
report-to: {"endpoints":[{"url":"https:\/\/a.nel.cloudflare.com\/report\/v3?s=2L8CVnwdl53yq%2FTuFpAcPaK916%2F9os6zeudZ44rZEzwHfX5rxXJztZYquOWvZpfAP8A0xoSShvt8SXIAcNUQ9h%2FU3FHEHFniiSEOrEmdyu%2Fvd0dFMkiiOUUA7uD%2BX%2BYNyCa686M1E3c7fCLq5g%3D%3D"}],"group":"cf-nel","max_age":604800}
nel: {"success_fraction":0,"report_to":"cf-nel","max_age":604800}
vary: Accept-Encoding
server: cloudflare
cf-ray: 74030a06ab5891ef-FRA
alt-svc: h3=":443"; ma=86400, h3-29=":443"; ma=86400