Unable to write device tag

[Norton-breman]

Hello,

I'm trying unsuccessfuly to set a new device tag in the device control characteristics. Using python and Bleak library, I'm able to connect to a dot, to set filter profile index and output rate but when I set a new tag with corresponding tag length changes are not taken into account and no error is thrown.
For that, I create a 16bytes array, write new tag to the first n bytes encoded in ascii and then add it to the reste of message (before adding output_rate, filter_profile_idx and reserved data). When i look at the generated bytes message it's looks like good but it is changing neither the tag length neither the tag.

Any idea ?

Antoine