What to do if the Outlook App is Not Syncing?
Making sure your device is connected to a reputable Wi-Fi network is the first step in fixing Outlook App Not Syncing. By examining the connection, you might find out if other programs have issues connecting to the network.
Try these if your connection is generally having issues. In addition to your wireless router, restart your smartphone or tablet. For a few minutes, activate Airplane mode. To sync your emails once again, disable it, join a network, and try again. Network settings should be left alone.
https://www.emailsupport.us/blog/outlook-app-not-syncing-with-android-or-ios/
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