Application Portals

Hello,
I am an EU undergraduate applicant seeking to study law. I have applied for KCL, QMUL, Warwick, Bristol and LSE LLB a few days ago. After submitting my UCAS application and having it confirmed, I received emails from some of the universities above to log in to their application portals.
So far, I was able to log in only to King's Apply. I have received the login information from QMUL as well, yet I have not been able to enter the MySIS Platform. At every attempt, I receive the "user unauthorised - contact the IT team" message, despite waiting well over the minimum 24 hours. I did contact the admissions team for further information, yet I was wondering if anybody knows how quickly they usually respond (I'm quite stressed by nature).
Regarding the other universities, I have only received a confirmation for my application for Warwick. Does anybody know if Warwick, Bristol and LSE have any application portals, and if they do, how long does it take for one to receive the login credentials?
Thank you!
EDIT: QMUL MySIS worked. I tried logging in randomly, and I managed to access it. Would really appreciate an answer to my other question!

You have to register for your Warwick applicant account, you can do it with the link below.
https://warwick.ac.uk/services/idg/services-support/accounts/applicant_accounts/
When I registered for my account it took around an hour for me to be able to access it. Unsure about the other two universities however.