Quick answer: PARASOLL does not need a Thread Border Router
The current US PARASOLL page and manual describe a Zigbee sensor. Use DIRIGERA when IKEA Home smart app notifications and remote routines are wanted, or follow IKEA's supported direct-light pairing path for a simple local automation. A Thread Border Router is not the missing requirement for PARASOLL.
MYGGBETT is the IKEA Matter-over-Thread sensor
IKEA lists MYGGBETT as a Matter-over-Thread door and window sensor. It therefore needs a compatible Thread Border Router. DIRIGERA can fill that role, but buyers using Apple, Google, Amazon, Samsung, Homey, or another ecosystem should verify the exact controller and border-router hardware already installed before buying another hub.
DIRIGERA performs different jobs for the two sensors
For PARASOLL, DIRIGERA is the IKEA Zigbee hub that enables app notifications and wider IKEA Home smart control. For MYGGBETT, IKEA identifies DIRIGERA as an example Thread Border Router for the Matter-over-Thread path. The same hub name does not make the two sensors use the same radio.
Do not follow a PARASOLL setup guide for MYGGBETT
A ten-second Zigbee pairing sequence near an IKEA bulb belongs to PARASOLL's documented direct-light path. MYGGBETT should be commissioned through its Matter ecosystem and Thread network. Check the article number and product name on the package before resetting hardware or rebuilding the home network.
Aqara P2 is the closest commissionable alternative
Aqara P2 is also native Matter over Thread and requires a compatible Matter controller plus Thread Border Router. It is worth comparing when the household wants a current Amazon option, already uses Aqara Home or Hub M3, or needs Aqara's ecosystem-specific automation guidance. It is not a drop-in Zigbee replacement for PARASOLL.
Choose from the system already running
Keep PARASOLL when DIRIGERA and IKEA Zigbee routines already work. Choose MYGGBETT when the goal is a current IKEA Matter-over-Thread sensor. Choose P2 when native Matter, Aqara support, or its merchant path is more useful. Avoid buying a new hub until the existing Matter controller, Thread Border Router, and Zigbee hub inventory is written down.
Check placement before protocol
All three products still depend on magnet alignment, frame depth, adhesive or screw placement, battery access, and a clear opening path. Dry-fit the sensor, confirm state changes in the final app, and keep packaging until the intended automation and notification both work.