Speed Test No Longer Working After Upgrading to Pro

I have just upgraded from free to pro, and while the speed test always worked fine before, it has now suddenly stopped working. I have toggled all the firewall settings to no avail. All others settings remain the same since I was on the free plan. Here is the error I am getting:

API Request Failed: GET /api/v4/zones/e118bbe99a558722f29ff694e0f8bc58/speed_testing (504)

Could below article help a bit?:

May I ask, have tried using a differet Web browser, or a Private Window (Incognito mode), maybe a different device while accessing Cloudflare dashboard and Speed Test?

If it does not work, you might have to contact Cloudflare Support by creating a ticket by:

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I can try this, but as it worked fine in the same browser on the free plan before I upgraded, I fail to see how this could be the cause of the issue. I guess I will have to wait for support.