Hi @Abhimanyu Sharma , 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:
SSPR stopped working for everyone in your organization.
Solution: You resolved your issue by
- Start the AADConnect wizard and disable Password Writeback
- Performed a delta sync
- Start the AADConnect wizard and enable Password Writeback
Thank you again for your time and patience throughout this issue.
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Please remember to "Accept Answer" if any answer/reply helped, so that others in the community facing similar issues can easily find the solution.