The first thing you should do here is to disable problematic add-ins. It’s not easy to tell which add-in could be the culprit, therefore, your best bet is to disable all add-ins, then enable them one ...
One of the forum users reported that the Group inbox (WFP, SEO, SPP) doesn’t work in the app. Neither it’s getting updated, nor he can’t receive emails. However, it works well when using a browser.
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