Index S2 scale does not sync guests

Hi,

My Garmin scale has been working seamlessly with my Garmin account where I am the owner. I add my wife she used her Garmin connect account where I invited her, she accepted (and pressed the get started option). The scale recognize her, her 4-letter name appears on the scale screen, but do not sync her data. The wifi logo and the connection bar behaves the same as in my case, but anyway her data does not appear in her account.

She has given permission on her Garmin Connect account to upload data.

I already reset it, configured the wifi again, the battery of the scale is not low, and the problem remains: my (owner) data syncronizes fine but my wife's account appears in the scale but her data does not synchronize with her Garmin connect account.
What else can I do to solve this issue?

Thanks,

Jaime