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I posted the first reply about how similar my problem was to yours. Mine resolved over a month ago. I'm very sure this is a duplicate content issue. It doesn't matter if they are different servers, markets etc. When you "look" at the sites they "look" the same. Google was taking a default PLESK server page for my domain and showing other sites (3 in total) that also had the same default page. Different servers, different owners and different industries.

I think if you continue to ignore this advice you will have this issue forever. You either need to make the sites different (or at least the home pages) or combine them into a single site and map your existing link juice from one to the other with redirects. You then need to serve the different data based on geolocation.

Depending on your web site, servers, support team etc this could be a very difficult job.

I have been a MOZ subscriber for a few years now. I don't think MOZ works for .dating and .chat domain extensions. I have 2 sites that have authority 1 despite back links. Here are the details:

https://oooo.dating > DA = 1

https://talk.chat > DA = 1

oooo has 221 links (Google search console)

talk has 1317 links (Google search console)

May be a MOZ staff member can look into this. If you are customer and use some of the newer domain extensions please share your details if you have the same problem.

See what Google thinks with the site:yourdomain.com search. This will give you all the data they have on your site. Look for errors, missing content and duplicate content. I think that would be a good start. Also use Google Search Console to check for index issues, crawl issues and any manual actions. If a site is offline for a while it will be delisted, a big site is delisted after a few minutes, in my experience the traffic returns after 1 or 2 weeks. To make it more complex there seems to have been a few changes to Google results over the past weeks, may be due to the 'mobile first' index.