@Vinod Survase Thanks for posting in our Q&A.
If you deploy apps to "All users", only this tenant's Azure AD users signed in this device can see these apps.
If you deploy apps to "All devices", these apps are installed in the device, Azure AD users and local users all can see these apps.
For deployment failure issue, it is needed to troubleshoot one by one. There is no method to guarantee that app deployment will be 100% successful. Maybe some issues are from intune and maybe some issues are from device itself.
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