Hi @Rajib_37939,
Please check the following post for your issue:
Please follow these steps to whitelist IP:
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Login into your Atlas account and Click on Network Access tab under Security Section

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Then click “IP Whitelist” followed by “Add IP Address”. If there is already any IP address, click Edit under Actions setion.
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Finally, click “Allow Access from Anywhere” and click “Confirm”.
Please let me know, if you are still facing any issue.
Thanks,
Sonali