Do not give the alias or your account credentials to the family member; keep the active address on your account and share Microsoft 365 Family with the family member’s own Microsoft account instead.
An alias is another address for the same Microsoft account. It shares that account’s inbox, contacts, storage, subscriptions, settings, and password—it is not a separate mailbox or user account that can safely be assigned to somebody else.^1^
Share the subscription without changing your active address
- Sign in to the Microsoft 365 Services & subscriptions sharing page using the account that owns the subscription.
- Select Share.
- Choose either:
- Email invite and enter an email address belonging to the family member; or
- Create link, then send that link directly to them.
- Have the family member open the invitation and sign in with their own Microsoft account. If they do not have one, Microsoft will prompt them to create one.
- They select Join now to join your family group and receive the shared benefits.
The invitation must be accepted within 48 hours. Microsoft 365 Family can be shared with up to five other people, while your subscription remains attached to your existing account.^2^
Important alias limitation
If the alias is an existing @outlook.com, @hotmail.com, @live.com, or @msn.com address, removing it will not let you attach it to the family member’s Microsoft account. Microsoft states that existing addresses from those domains cannot be added as aliases to another account.[^3^](https://support.microsoft.com/outlook/something-went-wrong-with-error-addriverstoreaccessnonlocalexception#add-another-alias-to-your-account-and-make-it-the-primary-alias "Something went wrong" with error ADDriverStoreAccessNonLocalException | Microsoft Support)
Therefore:
- Keep the active alias if you cannot afford to lose it.
- Do not remove it in an attempt to transfer it.
- Do not share your password, because that would give the family member access to the same Microsoft account, inbox, storage, settings, and subscription management.
- Have the family member create or use a separate address and accept the Microsoft 365 sharing invitation with that account.
If the invitation says the person is already in another family group, they must leave that group before accepting yours.^2^
References
- Change the email address for your Microsoft account
- How to share your Microsoft 365 Family subscription
- "Something went wrong" with error ADDriverStoreAccessNonLocalException | Microsoft Support