I thought you might be interested in looking at Can't access MP servers "No entry ....Documents\Arma3\mpmissions\tempMissionMP.Altis\mission.sqm.Mission" message.
https://forums.bohemia.net/forums/topic/221820-cant-access-mp-servers-no-entry-documentsarma3mpmissionstempmissionmpaltismissionsqmmission-message/
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