nRF52840 Dongle only receives a notification packet with a payload 20 bytes or less

I'm using the Nordic Python libraries to receive the BLE data. I can send the data from our board with the nRF52840 chip on it. If I send the data to my Android phone with the nRF Toolbox app, I can send a packet with a payload of 60 bytes. Sending the same thing to the Nordic dongle, it only allows for a payload of 20 bytes or less.

The Python examples suggest an MTU of 250. Is there anything I can do to increase the payload size to send more bytes?

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