Symptoms
Once "Access to Cloud Store" feature is enabled and authentication is set up for online store, it breaks the proper functioning and users cannot operate online store and order services.
Browser console contains the errors:
{"error":"APS::Util::Exception","message":"invalid Authorization header: doesn't start with OAuth "}
Cause
Cloud Store authentication represents regular Apache authorization implemented through .htaccess file.
Once authorized HTTP header 'Authorization' is added to authorized user's requests. That header is not recognized by OA and therefore considered as invalid.
That behavior will the fixed in the scope of the software issue #APS-44432.
Workaround
Disable "Access to Cloud Store" feature