SCIM provisioning cannot be done due to cloudflare blocks it

SCIM configuration on GitLab SaaS cannot be done with Azure. During configuration of SCIM and Azure provider, after click test connection - error occurs:

Error code: SystemForCrossDomainIdentityManagementCredentialValidationUnavailable
Details: We received this unexpected response from your application:

Received response from Web resource.
Resource: https://gitlab.com/users/sign_in
Operation: GET
Response Status Code: ServiceUnavailable
Response Headers: Transfer-Encoding: chunked
Connection: close
X-Frame-Options: SAMEORIGIN
cf-request-id: 099b19d1ec0000202cf9b26000000001
Expect-CT: max-age=604800, report-uri=“https://report-uri.cloudflare.com/cdn-cgi/beacon/expect-ct
CF-RAY: 643ec59648a5202c-AMS
Cache-Control: no-store, must-revalidate, no-cache, max-age=0, private, post-check=0, pre-check=0
Date: Thu, 22 Apr 2021 12:14:26 GMT
Server: cloudflare
Response Content:

Checking your Browser - GitLab body{color:#666;text-align:center;font-family:Helvetica Neue,Helvetica,Arial,sans-serif;margin:auto;font-size:14px;display:flex;flex-direction:column;align-items:center;justify-content:center}hr{max-width:800px;margin:18px auto;border:0;border-top:1px solid #eee;border-bottom:1px solid #fff}img{max-width:40vw}.container{margin:auto 20px}.cferror_details{list-style-type:none}.cf-error-details h1{color:#456;font-size:20px;font-weight:400;line-height:28px}

GitLab Logo

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<h1><span data-translate="checking_browser">Checking your browser before accessing</span> gitlab.com.</h1>

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