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Performing a manual policy refresh on devices to apply the updates is the correct action to take in this scenario. When applications are deployed through Microsoft Intune, they rely on the device's policy to recognize and install updates. If users are unable to access the updated versions of applications, it may be due to the devices not recognizing that an update is available or not applying the latest policy that includes these updates.

By triggering a manual policy refresh, you prompt the devices to check in with Intune and receive any new instructions or updates pertaining to application installations. This can help resolve issues caused by delayed or failed automatic policy applications, ensuring that the devices are up-to-date with the latest versions of the applications as intended.

On the other hand, verifying network connectivity and rebooting the devices might address some underlying connectivity issues, but it does not directly ensure that updated policies will be applied. Checking for application conflicts is also a relevant troubleshooting step, but it may not be the root cause if the primary issue is that policies have not been refreshed. Lastly, deleting and redeploying all applications is a more drastic measure that may not be necessary and could lead to further complications or downtime for users. Thus, a manual policy refresh is a more efficient approach to ensure