Office365 personal accounts do not support query strings in the redirect URL.
Reference: Microsoft Identity Platform - Reply URLs

Workaround for Apache web server:
To support a clean redirect URL (without query parameters), the server administrator can add the following rewrite rule to the .htaccess file:
 
RewriteEngine On
RewriteRule ^/oauth\.authorize$ /zabbix.php?action=oauth.authorize [QSA,L,PT]

This enables the use of a simplified redirect URL like:
http://server-name/zabbix/oauth.authorize
instead of a URL with query parameters, ensuring compatibility with Office365 personal accounts.