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DS90UB936-Q1: Cannot establish I2C link with DS90U935

Part Number: DS90UB936-Q1


Hello

Trying to understand what's required to make the I2C back channel function.

I have written the following registers:

0x01,0x01  
0x4c,0x01
0x33,0x31
0x58,0x58
0x5c,0x50
0x5d,0x64
0x5e,0x18
0x65,0x64
0x66,0x18
0x4a,0x10
0x7c,0x01
0x70,0x1f

I do not get a lock status.  I have checked that the SER ID is being populated with the correct value based on IDX voltage.  Reads and writes to address 0x50 are not being acked.

Thanks