Loads of 521 errors on test site

My Wordpress website is working fine.
I have created a staging website, which is an exact copy but that one does not work.
When I go to wp-admin I get error like this:

GET https://simnigeria.org/test/wp-includes/js/media-views.min.js?ver=e54c83c1d9db9936d9257349b2804611 net::ERR_ABORTED 521

I have these rules:

1

STARmydomain/STARwp-admin/STAR
Browser Cache TTL: 30 minutes, Always Online: Off, Cache Level: Bypass, Disable Apps, Disable Performance

2

STARmydomain/testSTAR
Browser Cache TTL: 30 minutes, Always Online: Off, Security Level: Essentially Off, Cache Level: Bypass, Disable Performance

3

STARmydomain/STARpreview=trueSTAR
Cache Level: Bypass

Can someone help?
SOrry I dont know how to escape a star symbol

For me, it’s showing an 404 not found error.

Sorry I was troubleshooting should be back now

For me it’s working

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