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TI BLE Multitool iOS App vs TI BTool

When my keyfob transmits customized ADV_NONCONN_IND advertising packets (with modified advertData[] ), I see the expected advert data received as desired using TI's BTool sw with dongle. All is good.

But simultaneous reception by an iPhone running TI BLE Multitool app always shows the following regardless of the length OR contents of the advertising packet (that I can see is changing using BTool).  Why?  Where does this 16 byte string come from?

D3C1CCA0-41D4-732A-BE61-A168BDC4A1C1

My apologies - I feel I must be missing something basic here...

GG