Block sub URL XG Firewall

I want to specifically block a sub URL https://app.powerbi.com/groups/me/getdata but nothing else under app.powerbi.com.

I've done this by creating a Category and adding Domain/keyword as app.powerbi.com/groups/me/getdata If I go to https://app.powerbi.com and then browse through the menus to https://app.powerbi.com/groups/me/getdata the page is not blocked.

If at this point I click refresh, then the page is then blocked. If I paste https://app.powerbi.com/groups/me/getdata its blocked.

I've read articles that say this should work but I'm getting this intermittent behaviour. I'm using Scan HTTP and decrypted HTTPS and Decrypt HTTPS during web proxy filtering.

I've logged this Sophos support and I'm no further forward, they've basically checked over the settings.

I'm running SFOS 18.0.3 MR-3