Hi @umaunnikrishnan,
Lab validation can be quite strict and often fails due to very small differences between your instance and what the simulator is expecting to see.
To help narrow this down, could you share the exact validation error message you're seeing, and confirm which course and module/task this relates to? Screenshots can also help if you're able to share them.
In the meantime, it's worth double checking the ask instructions step by step and confirming that your instance matches them exactly, including things like user impersonation, spelling, and correct filters.
Once you can share a bit more detail, it should be easier to pinpoint what might be causing the validation to fail.
