
Dear Giuseppe77YO,
Welcome to the Microsoft Community.
I understand that you would like to share your Microsoft 365 subscription with your wife, but when accepting the invitation it shows that you are already in another family group and can't opt out, I understand your frustration and will do my best to help you troubleshoot.
I noticed that you seem to have chatted with support to troubleshoot the issue, but it seems to be a bit of a problem, so please rest assured that I will do my best.
In order to better understand the status of the issue, I would like to confirm some information with you:
- Are the members of your family group showing up correctly on the subscription screen of your current Microsoft account? Please note that the family group can be shared with up to 5 other people, so if you go beyond that, you may need to remove the other members before adding others. Microsoft account | Subscriptions
- Are you able to view the information that a family group has been added in your wife's subscription screen? Microsoft account | Subscriptions
- Usually, if your wife is the organiser of the family group, it is possible to log out of the family group or remove family members. Did you follow the instructions in this article? Leave family group or remove members - Microsoft Support
- Is it possible to remove your ‘fake’ daughter's account from your wife's family group? If it is a child's account, please note the removal of a child's account:
- Click on the three dots in the upper right corner, and then click Manage Licence.
- On the next screen, select Remove Child Account Licence and then click OK on the next screen:
- Does it prompt some error message when you are unable to remove it? If so, I hope you can share a screenshot with us, I think it will give us a clearer picture of the problem.
I look forward to your further updates, and hope to learn more from you to confirm the direction of the problem for further investigation.
Thank you for your understanding and patience, May this wonderful holiday season bring you happiness, peace, and cheer.
Best regards
Isabella-MSFT | Microsoft Community Support Specialist