Child account not active after renewing adult attached

Hi, my son and I have had active Adult and child account working prefecture in the past, after allowing my account to lapse, today I renewed my adult account, but when I log my son in, it still says his trial period is expired.

How do I reinstate his free Child account under my active paid account again?

I tried clicking on Upgrsde for the Child account but it asks to pay the full adult monthly fee again

Thanks

You might have to redo the consent: https://zwift.com/kids?utm_source=email&utm_medium=txt-updatedconsentform&utm_campaign=Zwift_ALL_updatechildform_july20