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First thing I would do, is change it back immediately.
Then I'd work on 1 site at a time and make 1 change at a time and see the results. Eventually you'll find the issue before applying it to everything else.
It seems like a simple change but if you're using cloudflare and wordpress, there could be additional steps, I had to make changes in wordpress settings, DNS, and in cloudflare to make it work properly for each domain.
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