Then it occurred to me… could a WiFi access point within a few feet of the sensor be interfering with the motion sensor, enough to throw an alarm condition?
Typically, it takes a change in heat to trip a PIR and not wi-fi signaling.
Check to see if the lens is dirty, spiderwebs/debris/etc can have a negative impact on motion false triggers.
Similarly, motions mounted near HVAC vents or pointed towards windows where the sun can cross the lens path can also trigger false motions.
How old is the motion sensor and what is the make/model?
is it possible to arm my system via the alarm.com app and bypass the motion? When I select “force bypass” the Away option gets greyed out.
Specific sensors cannot be bypassed. When Force Bypass is selected, the only option is Arm Stay. Arm Away is not an option and will be greyed out.
If the Force Bypass option is not selected when sending an arming command, the system protests the arming command for about 4 minutes, but it then bypasses any open zones after that protest period.