Birthdate greyed out - watch and Garmin Connect iOS

Hi there,

Just realized the birthdate on my watch and on Garmin connect is greyed out. 

If I remember correctly, it happened after the 20.19 on my Enduro 3 or the latest Garmin Connect update.

I can only update the birthdate on Garmin Connect (web).

Is this something expected or a bug?

Could someone please help me out?

Thanks, n