Wordpress.com login issue after setting Cloudflare CDN

On Cloudflare CDN, I have set up my wordpress.com website, of which the domain name is purchased on Wordpress.com. After setting up, it works very well but only one thing which is unusual: When I visit my website, and then I tried to login to wordpress.com by clicking the three dots in the bottom left corner, after I input my username and password and finish 2FA, the URL getting stuck at:
https://r-login.wordpress.com/remote-login.php?action=link&back=https%3A%2F%2Fexample.com%2F
(nothing happens if I try to refresh this web address)
If I pause Cloudflare, this problem is gone.
This must be related to some protection function provided by Cloudflare. But I tried my best to troubleshoot I still can’t solve this. Anyone has ideas about this? Thanks a lot!

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