Hi @Sid Mohiddin ,
I'm glad that you were able to resolve your issue and thank you for posting your solution so that others experiencing the same thing can easily reference this! Since the Microsoft Q&A community has a policy that "The question author cannot accept their own answer. They can only accept answers by others ", I'll repost your solution in case you'd like to "Accept " the answer.
Issue:
After following the "forgot my password" flow and selecting "Send verification code", you received the following error when clicking "Verify Code":
AADB2C90278: Unable to validate the information provided
.
Solution:
In your case, you were able to resolve the issue by making the Verification Code field a required field.
The error typically means that one of the validation technical profiles is failing in that step of the journey.
Normally the best way to diagnose this issue is to collect logs to discern why the failure is occurring.
If I missed anything please let me know and I'd be happy to add it to my answer, or feel free to comment below with any additional information. If you have any other questions or are still running into more issues, please let me know.
Thank you again for your time and patience throughout this issue.
Please remember to "Accept Answer" if any answer/reply helped, so that others in the community facing similar issues can easily find the solution.