Microsoft 365 features that help users manage their subscriptions, account settings, and billing information.
Based on your additional comments, it seems that your subscription has been renewed but is still showing as expired. If this is the case, it could explain why the Share button is missing from your subscription.
Could you please sign in to https://account.microsoft.com/services using the same Microsoft account and double check whether your Microsoft 365 Family subscription is still showing as expired?
Are you sure this is the subscription you renewed?
If so, I recommend contacting Microsoft Support directly so they can investigate the issue and check your account:
Click this link: https://support.microsoft.com/contactus/
Sign in to your Microsoft account.
Select Microsoft 365 > Click 'Get home support'.
Type "Chat with an agent" from the text field and press Enter.
Click "Contact support" at the bottom.
Select the product you need help with.
Follow the prompts to connect with a live agent or request a call back.