This is about the changes of tracking your application, I have seen that my receipt has no tracking number which is usually in AMAN/____/___/1 format and I wasnt able to track it on VFS website, so I asked the manager why they did not give me a tracking number on my receipt.
An email from VFS manager:
"Hi Jennifer,
That is due to the transition. VFS will no longer handle any information services including the tracking of application module.
That too shall disappear from our website tomorrow or Friday the latest. All info services shall be handled by the UKVI effective 1 April.
Best regards,
Sesyll"