@Boopathi Subramaniam, Thanks for posting in Q&A. In fact, Microsoft Store for Business and Education retiring March 31, 2023.
Please confirm if you are accessing Microsoft store or Microsoft Store for business. If you are accessing Microsoft Store, please check if any similar policy in the following link has deployed via Intune which block the Microsoft Store.
How many devices are affected? If we try the suggestions in the following link, will the issue be resolved?
Please try the above suggestion and if there's any update, feel free to let us know.
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