Hi @Gurudas,
Thank you for posting your question in the Microsoft Q&A forum.
Based on the information you have provided, looks like you need to grant access back to a user who has been removed.
- Access Admin Center > All User > Deleted Users
- Restore the user you need.
- Once the user is restored, head back to SharePoint Admin Center.
- Select the site and add the user to site member (Make sure the user has license)
I hope this information helps
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