I have tried multiple times to set up family sharing to use my 200GB of iCloud storage space. Nothing works. When I try using my iPhone 11, I click on >iCloud >Share with family >Invite Family Members and then I get the "Cannot Complete Action, this action cannot be completed at this time." If I use my MBP, I click on >Family Sharing I get a window from which you click on "Get Started" and I get the same error message as that on my iPhone.
Did you first setup Family Sharing:
Set up Family Sharing - Apple Support
then share your iCloud storage:
Share an iCloud storage plan with your family - Apple Support
Did you first setup Family Sharing:
Set up Family Sharing - Apple Support
then share your iCloud storage:
Share an iCloud storage plan with your family - Apple Support
I can't even set up Family Sharing. Even in trying that, I get the message that it can't be completed at this time. I tried setting it up using both my iPhone 11 and then my MBP with Big Sur. Same problem. I tried doing it via iCloud, same thing.
Family sharing for iCloud storage
