It looks like some housekeeping is in order there. One reason being there are duplicates of some of the rewrite rules there. Quite likely there is at least one rule in the mix that’s not allowing the Authorization headers to pass from the app when it tries to connect to your site. It’s a guess to know which rules there would affect this. Since it’s looking like your site has the Bullet Proof Security plugin, a good place to start with troubleshooting this would be to go to the BPS plugin’s settings, and set it to remove its custom .htaccess rules. Then test the app to see if removing the BPS .htaccess rules makes any difference.
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