The solution was: my fault. this new accesspoints weren´t set on a floor map. So I couldn´t see them unless the floor maps were unselected. The solution from the Meraki service: Could You please deselect the floor plan? once I've done it, I saw all APs It can be done on the Radio Settings page, top right corner of the map > click on the layout icons > select "none" under floor plan.
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