Hi @alexeinporis,
I’ve performed some cross-testing for us today on several of my sites which have the latest versions of WordPress, WooCommerce v5.8.0 and our free [Storefront](https://www.ads-software.com/themes/storefront/) theme as the only enabled software. When doing so I’ve not been able to replicate the behaviour which you describe with not being able to access the WordPress Admin > WooCommerce > Home page.

Image Link: https://cloudup.com/c8nAerpHiu6
This indicates that something isolated to either your WordPress installation or web hosting server is potentially causing this behaviour on your site.
For reference, a 502 Bad Gateway error is server related and you can read more about that web error message below.
https://kinsta.com/blog/502-bad-gateway/
Have you tried uploading a fresh copy of the WooCommerce plugin to your website overwriting the existing copy? If not I’d suggest trying that just in case any files have been corrupted.
If you find that uploading a fresh copy of WooCommerce does not resolve this for you I’d suggest carrying out a full conflict test again.
To carry out a full conflict test on your site you can do that by disabling all other plugins aside from WooCommerce along with switching to a theme like Storefront. This will help with trying to and locate what software you have installed which could possibly be causing this behaviour? You could use a free plugin called Health Check and Troubleshooting to carry out such testing.
When in Troubleshooting mode all plugins will be deactivated and only the admin of the site carrying out the troubleshooting would see those changes. Any customers visiting the site would see no changes at all.
Once you have disabled all other plugins and switched themes if the behaviour is resolved you can then enable your theme and sites plugins testing after each one is enabled until the behaviour returns to locate the culprit.
https://docs.woocommerce.com/document/how-to-test-for-conflicts/
If the behaviour persists within only WordPress, WooCommerce and a theme like Storefront enabled I’d possibly reach out to your hosting company and have them check your WordPress installation. It could be something related to the site migration you performed.
I hope this helps.