WordPress “Add new tag” button is not working

I’ve had similar problem, maybe it’s not js issue, but XML instead.
Check if there are white spaces at end of the files involved ( after the PHP closing tag “?>”)
Hope it helps!

UPDATE

maybe ajax cross domain issue ( 307 Temporary Redirect ) last chance:
Set this entries on your .htaccess file

SetEnvIf Origin "^http(s)?://(.+\.)?(abc\.com)$" origin_is=$0 
Header always set Access-Control-Allow-Origin %{origin_is}e env=origin_is

replace abc\.com with your actual domain. For eg: (google\.com)

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