Unable to detect the presence of page caching

please tell me someone how to fix this isue in wordpress with Cloudflare
(Unable to detect page caching due to possible loopback request problem. Please verify that the loopback request test is passing. Error: Forbidden (Code: http_403)

The AMP plugin performs at its best when page caching is enabled. This is because the additional optimizations performed require additional server processing time, and page caching ensures that responses are served quickly.

Page caching is detected by looking for an active page caching plugin as well as making three requests to the homepage and looking for one or more of the following HTTP client caching response headers : cache-control , expires , age , last-modified , etag , x-cache , x-proxy-cache , cf-cache-status , x-kinsta-cache , x-cache-enabled , x-cache-disabled , cf-apo-via , x-srcache-store-status ,x-srcache-fetch-status cf-edge-cache.)

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Are you able fix this? I am also having the same issue.