Symptoms
Office365 Subdomain form, Sign up for a new Microsoft account step. On attempt to check is a subdomain is available - Continue button stay blocked.
Request for Office365/Tenant APS resource schema in browser console fails with Unauthorized Request Blocked error:
https://store.provider.com/aps/2/packages/dfdcb612-bbe4-4268-8c75-6b28548a44db/schemas/tenant.schema
<script type="text/javascript">
var _event_transid='192505620';
</script>
<TITLE>Unauthorized Request Blocked</TITLE>
where store.provider.com - is a webspace containing .htaccess file redirecting to the Online Store:
RewriteRule ^index\.php.* http://1.2.3.4/index.php?StoreID=1&subdir=&%{QUERY_STRING} [P,L]
Issue cannot be reproduced if: 1. Online Store URL is accessed from BA CP directly; 2. One is signed in Online Store under an existing user.
Cause
Unauthorized requests to Online Store are blocked on the provider side between the webspace itself and Online Store node.
Resolution
Ask provider to check if nothing blocks requests from the webspace to Online Store node. Also, consider upgrading Office365 APS package to version 17.1.2 and further since logic is changed there: APS resource schema is obtained from the /types endpoint rather then Management Node filesystem.