In case if it helps someone:
I was really anxious as I wasn't able to link my parents PR application. On 13th May (Monday) I submitted a web form and asked for the status, received a reply on 15th May (Wednesday) that the application is in progress and the document has been received. Today, 17th May (Friday), I was able to link the application and noticing that the letter "X" before the application number has been removed as well.
Summary: Sometimes by raising a webform, you get the updates immediately after the response. Same thing happened with me when I applied for my own PR.
All the best!