No RSSI measurements in the range between -50 and -80 dBm are available for AP1, AP3, AP5. Please try increasing the RSSI range for calibration in global settings for maps, or clear "Calibrate heat maps" to use predictive heat maps instead.

[lchisholm]

No RSSI measurements in the range between -50 and -80 dBm are available for AP1, AP3, AP5. Please try increasing the RSSI range for calibration in global settings for maps, or clear "Calibrate heat maps" to use predictive heat maps instead.

[weiliu]

Is there a solution for this problem?

[samantha_lynn]

A device connected to the AP that goes in to power saving mode would prevent a background scan on the AP with the settings you have currently. So it maybe not be the device that is listed as data collection, but there could be a device that the AP still considers connected that is in power saving mode. You have disabled background scans when a client is in power save mode. I would recommend enabling background scans when clients are in power save mode to increase the likelihood of a successful background scan.

[alden_xu]

don't understand what it means "a device that was still connected to the AP, so that would prevent the background scan on that AP."

[samantha_lynn]

Not necessarily the device we're looking at, but a device that was still connected to the AP, so that would prevent the background scan on that AP.