Cloudflare Pages was unable to be installed on your GitHub/GitLab account.

I signed up a new cloudflare and tried to deploy a repo of GitHub using pages. The GitHub account has never connected to any cloudflare account. After clicking "Add->Pages->Import an existing repository->connect github" on the clouldflare dashboard, I clicked "Authorize and Install" to install the cloudflare app in GitHub. Then the page redirects to the error page in Screenshot:"Cloudflare Pages was unable to be installed on your GitHub/GitLab account. Please attempt to fully uninstall and reinstall the installation." I checked that the Cloudflare app is installed in GitHub account. Then I uninstalled the app from GitHub and revoked the authorization of Clouldflare from Github. But when I repeat to connect the repo in Github with Cloudflare, I got the same error. In Cloudflare there is no any pages project. I guess after installing the clouldflare app in github, Cloudflare cannot receive any data to create a page project. I was using a "InPrivate Window" to make sure no cookies affact the process. Can somebody help, please? Is there any workaround? Thanks!