Google Home App - Matter commissioning fails

Hi - I am trying to commission my NRF5340DK board with NRF Connect SDK v.2.1.1 using Google Home App over Matter using the Matter light bulb sample.

My OTBR is a Google Nest Hub 2 running Chrome OS

My smartphone is Motorola Pure G running Android 11; Google Home Assistant app (GHA) version: 2.60.1.19

The GHA app is able to connect and begin the matter commissioning process. See the log from the NRF5340DK below. But after a few moments, while waiting to connect, the GHA "Connecting to Device Screen" abruptly closes (crashes?) and brings me back to my GHA home settings screen with nothing added.

Welcome any suggestions or advice. I am excited and eager to get my Nordic device to be controllable with GHA.

Thanks! Dan.

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uart:~$ I: nRF5 802154 radio initialized
I: 4 Sectors of 4096 bytes
I: alloc wra: 1, e20
I: data wra: 1, 310
*** Booting Zephyr OS build v3.1.99-ncs1 ***
I: Init CHIP stack
I: 173 [DL]BLE address: D0:50:98:AB:07:E6
I: 199 [DL]OpenThread started: OK
I: 202 [DL]Setting OpenThread device type to ROUTER
I: 207 [SVR]Server initializing...
D: 210 [FP]Initializing FabricTable from persistent storage
I: 216 [TS]Last Known Good Time: 2022-11-04T17:19:10
I: 221 [DMG]AccessControl: initializing
I: 225 [DMG]Examples::AccessControlDelegate::Init
I: 229 [DMG]AccessControl: setting
I: 232 [DMG]DefaultAclStorage: initializing
I: 236 [DMG]DefaultAclStorage: 0 entries loaded
D: 240 [IN]UDP::Init bind&listen port=5540
E: 244 [IN]SO_REUSEPORT failed: 109
D: 248 [IN]UDP::Init bound to port=5540
D: 251 [IN]BLEBase::Init - setting/overriding transport
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