Why won't my email update on my Android devices?

On both my GS7 Edge and Galaxy Tab A, my AT&T email account will not update, and has not synced since 7/25. Manual sync does nothing. However, on my Win10 PC, that account stays current through the day, every day. This situation is identical on my wife's Android devices as well (both phone and tablet), yet her Win10 laptop updates perfectly. Have not contacted anyone on this issue yet, as I am trying to figure out what the culprit is—AT&T, the OS, aliens? Anyone else have this issue? Thanks

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