Hi Veera Ragavan,
Thank you for reaching out to the Microsoft Q&A platform.
Based on your question description I understand that you want to Uninstall the Company Portal App.
Here are some steps you can take to troubleshoot and resolve this issue:
To uninstall the app successfully, make sure to remove the members or group assignment for install before assigning them to be uninstalled. If a group is assigned to both install an app and uninstall an app, the app will remain and not be removed.
Sign in to the Microsoft Intune admin center.
Please check the dynamic group AVD devices and specific groups are correctly excluded from the Company Portal app installation policy.
Check group assignments are not assigned to AVD devices or groups, and your configuration is with the desired user experience.
Review App Protection Policies in Intune to ensure that there’s no configuration enforcing the installation of Company Portal on the AVDs.
App Configuration Policy check that no settings are configured to automatically reinstall the Company Portal app.
Please find the below document for your reference:
https://zcusa.951200.xyz/en-us/mem/intune/apps/apps-add#uninstall-an-app
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Thank you.