Microsoft 365 features that help users manage their subscriptions, account settings, and billing information.
Hi there!
Aside from the suggestion above, make sure you also don't have any subscription on your account by going to https://account.microsoft.com/services page. If you have any subscription even a trial, make sure to cancel it before asking your husband to send the invitation again.
Once you have confirmed everything is good, just follow the steps provided to re-share the subscription.